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Myopia

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For other uses, seeMyopia (disambiguation).

Myopia
Other namesnear-sightedness, short-sightedness
Diagram showing changes in the eye with myopia
SpecialtyOphthalmology,optometry
SymptomsDistant objects appearblurry,close objects appear normal,headaches,eye strain[1]
ComplicationsRetinal detachment,cataracts,glaucoma[2]
CausesCombination of genetic and environmental factors[2]
Risk factorsNear work, greater time spent indoors, family history[2][3]
Diagnostic methodEye examination[1]
PreventionUnknown
TreatmentEyeglasses,contact lenses,surgery[1]
Frequency1.5 billion people (22%)[2][4]

Myopia,also known asnear-sightednessandshort-sightedness,[5]is aneyedisease[6][7][8]where light from distant objects focuses in front of, instead of on, theretina.[1][2][7]As a result, distant objects appearblurrywhile close objects appear normal.[1]Other symptoms may includeheadachesandeye strain.[1][9]Severe myopia is associated with an increased risk ofmacular degeneration,retinal detachment,cataracts,andglaucoma.[2][10]

Myopia results from the length of the eyeball growing too long or less commonly thelensbeing too strong.[1][11]It is a type ofrefractive error.[1]Diagnosis is by the use ofcycloplegicsduring eye examination.[12]

Tentative evidence indicates that the risk of myopia can be decreased by having young children spend more time outside.[13][14]This decrease in risk may be related tonatural lightexposure.[15]Myopia can be corrected witheyeglasses,contact lenses,or byrefractive surgery.[1][16]Eyeglasses are the simplest and safest method of correction.[1]Contact lenses can provide a relatively wider correctedfield of vision,but are associated with an increased risk of infection.[1][17]Refractive surgeries likeLASIKandPRKpermanently change the shape of thecornea.Other procedures includeimplantable collamer lens(ICL) inside the anterior chamber in front of the natural eye lens. ICL doesn't affect the cornea.[1][18]

Myopia is the most common eye problem and is estimated to affect 1.5 billion people (22% of the world population).[2][4]Rates vary significantly in different areas of the world.[2]Rates among adults are between 15% and 49%.[3][19]Among children, it affects 1% of rural Nepalese, 4% of South Africans, 12% of people in the US, and 37% in some large Chinese cities.[2][3]In China the proportion of girls is slightly higher than boys.[20][21]Rates have increased since the 1950s.[19]Uncorrected myopia is one of the most common causes ofvision impairmentglobally along withcataracts,macular degeneration,andvitamin A deficiency.[19][22][23][24]

Etymology

[edit]

The termmyopiais ofKoine Greekorigin:μυωπίαmyōpia'short-sight'andμυωπίασις(myōpiasis)'short-sight-ness'.It is derived from theancient Greekμύωψ(myōps)'short-sighted'(man), fromμύειν(myein)'to shut the eyes'andὤψ(ōps)'eye, look, sight'(GENὠπός(ōpos)).[25][26][27][28][29]The opposite ofmyopiain English ishypermetropia,orfar-sightedness.[30]

Signs and symptoms

[edit]
Near-sighted vision (left), normal vision (right)

A myopic individual can see clearly out to a certain distance (thefar pointof the eye), but objects placed beyond this distance appearblurred.[16][31]If the extent of the myopia is great enough, even standard reading distances can be affected. Upon routine examination of the eyes, the vast majority of myopic eyes appear structurally identical to nonmyopic eyes.[32][31]

Onset is often in school children, with worsening between the ages of 8 and 15.[33][34]

Myopic individuals havelarger pupilsthan far-sighted (hypermetropic) andemmetropicindividuals, likely due to requiring less accommodation (which results in pupil constriction).[35][36]

Causes

[edit]

The underlying cause is believed to be a combination of genetic and environmental factors.[2][37][38]Risk factors include doing work that involves focusing on close objects, greater time spent indoors, urbanization, and a family history of the condition.[2][3][39][40]It is also associated with a highsocioeconomic classand higher level of education.[2][40]

A 2012 review could not find strong evidence for any single cause, although many theories have been discredited.[41]Twin studiesindicate that at least some genetic factors are involved.[33][42][43]Myopia has been increasing rapidly throughout the developed world, suggesting environmental factors are involved.[44]

A single-author literature review in 2021 proposed that myopia is the result of corrective lenses interfering withemmetropization.[45]

Genetics

[edit]

A risk for myopia may be inherited from one's parents.[46]Genetic linkagestudies have identified 18 possible loci on 15 differentchromosomesthat are associated with myopia, but none of these loci is part of the candidate genes that cause myopia. Instead of a simple one-gene locus controlling the onset of myopia, a complex interaction of many mutated proteins acting in concert may be the cause. Instead of myopia being caused by a defect in a structural protein, defects in the control of these structural proteins might be the actual cause of myopia.[47]A collaboration of all myopia studies worldwide identified 16 new loci for refractive error in individuals of European ancestry, of which 8 were shared with Asians. The new loci include candidate genes with functions in neurotransmission, ion transport, retinoic acid metabolism, extracellular matrix remodeling and eye development. The carriers of the high-risk genes have a tenfold increased risk of myopia.[48]Aberrant genetic recombination and gene splicing in the OPNLW1 and OPNMW1 genes that code for two retinal cone photopigment proteins can produce high myopia by interfering with refractive development of the eye.[49][50]

Human population studies suggest that contribution of genetic factors accounts for 60–90% of variance in refraction.[51][52][53][54]However, the currently identified variants account for only a small fraction of myopia cases, suggesting the existence of a large number of yet unidentified low-frequency or small-effect variants, which underlie the majority of myopia cases.[55]

Environmental factors

[edit]

Environmental factors which increase the risk of myopia include insufficient light exposure, low physical activity, near work, and increased year of education.[33]

One hypothesis is that a lack of normal visual stimuli causes improper development of the eyeball. Under this hypothesis, "normal" refers to the environmental stimuli that the eyeball evolved to.[56]Modern humans who spend most of their time indoors, in dimly or fluorescently lit buildings may be at risk of development of myopia.[56]

People, and children especially, who spend more time doingphysical exerciseandoutdoor playhave lower rates of myopia,[57][56][58][59][44]suggesting the increased magnitude and complexity of the visual stimuli encountered during these types of activities decrease myopic progression. There is preliminary evidence that the protective effect of outdoor activities on the development of myopia is due, at least in part, to the effect of long hours of exposure todaylighton the production and the release of retinaldopamine.[44][60][61][62]

Myopia can be induced with minus spherical lenses,[63]and overminus in prescription lenses can induce myopia progression.[64][65]Overminus during refraction can be avoided through various techniques and tests, such as fogging, plus to blur, and theduochrome test.[65]

The near work hypothesis, also referred to as the "use-abuse theory" states that spending time involved in near work strains the intraocular and extraocular muscles. Some studies support the hypothesis, while other studies do not.[3]While an association is present, it is not clearly causal.[3]

Myopia is also more common in children withdiabetes,childhood arthritis,uveitis,andsystemic lupus erythematosus.[33]

Mechanism

[edit]

Because myopia is a refractive error, the physical cause of myopia is comparable to any optical system that is out of focus.BorishandDuke-Elderclassified myopia by these physical causes:[66][67]

  • Axial myopia is attributed to an increase in the eye's axial length.[68]
  • Refractive myopia is attributed to the condition of therefractiveelements of the eye.[68]Borish further subclassified refractive myopia:[66]
    • Curvature myopia is attributed to excessive, or increased, curvature of one or more of the refractive surfaces of the eye, especially the cornea.[68]In those withCohen syndrome,myopia appears to result from high corneal and lenticular power.[69]
    • Index myopia is attributed to variation in theindex of refractionof one or more of the ocular media.[68]

As with any optical system experiencing adefocus aberration,the effect can be exaggerated or masked by changing theaperture size.In the case of the eye, a large pupil emphasizes refractive error and a small pupil masks it. This phenomenon can cause a condition in which an individual has a greater difficulty seeing in low-illumination areas, even though there are no symptoms in bright light, such as daylight.[70]

Under rare conditions, edema of theciliary bodycan cause an anterior displacement of the lens, inducing a myopia shift in refractive error.[71]

Diagnosis

[edit]

A diagnosis of myopia is typically made by aneye care professional,usually anoptometristorophthalmologist.This is byrefractingtheeyewith the use ofcycloplegicssuch asatropinewith responses recorded whenaccommodationis relaxed.[12]Diagnosis of progressive myopia requires regulareye examinationusing the same method.[12]

Types

[edit]

Myopia can be classified into two major types;anatomicaland clinical. The types of myopia based on anatomical features are axial, curvature, index and displacement of refractive element.Congenital,simple and pathological myopia are the clinical types of myopia.[5]

Various forms of myopia have been described by their clinical appearance:[67][72][73]

  • Simple myopia: Myopia in an otherwise normal eye, typically less than 4.00 to 6.00diopters.[74]This is the most common form of myopia.
  • Degenerative myopia, also known as malignant, pathological, or progressive myopia, is characterized by markedfunduschanges, such as posteriorstaphyloma,and associated with a highrefractive errorand subnormal visual acuity after correction.[68]This form of myopia gets progressively worse over time. Degenerative myopia has been reported as one of the main causes ofvisual impairment.[75]
  • Pseudomyopiais the blurring of distance vision brought about byspasmof theaccommodationsystem.[76]
  • Nocturnal myopia: Without adequate stimulus for accurate accommodation, the accommodation system partially engages, pushing distance objects out of focus.[74]
  • Nearwork-induced transient myopia (NITM): short-term myopic far point shift immediately following a sustained near visual task.[77]Some authors argue for a link between NITM and the development of permanent myopia.[78]
  • Instrument myopia:over-accommodation when looking into an instrument such as amicroscope.[73]
  • Induced myopia, also known as acquired myopia, results from various medications, increases inglucoselevels,nuclear sclerosis,oxygen toxicity(e.g., from diving or from oxygen and hyperbaric therapy) or other anomalous conditions.[74]Sulphonamidetherapy can cause ciliary body edema, resulting inanteriordisplacement of the lens, pushing the eye out of focus.[71]Elevation ofblood-glucoselevels can also cause edema (swelling) of thecrystalline lensas a result ofsorbitolaccumulating in the lens. This edema often causes temporary myopia.Scleral buckles,used in the repair ofretinal detachmentsmay induce myopia by increasing the axial length of the eye.[79]
  • Index myopia is attributed to variation in the index of refraction of one or more of the ocular media.[68]Cataracts may lead to index myopia.[80]
  • Form deprivation myopia occurs when the eyesight is deprived by limited illumination and vision range,[81]or the eye is modified with artificial lenses[82]or deprived of clear form vision.[83]In lower vertebrates, this kind of myopia seems to be reversible within short periods of time. Myopia is often induced this way in various animal models to study thepathogenesisand mechanism of myopia development.[84]

Degree

[edit]

The degree of myopia is described in terms of thepowerof the idealcorrection,which is measured indiopters:[85]

Age at onset

[edit]

Myopia is sometimes classified by the age at onset:[85]

  • Congenital myopia, also known as infantile myopia, is present at birth and persists through infancy.[74]
  • Youth onset myopia occurs in early childhood or teenage, and the ocular power can keep varying until the age of 21, before which any form of corrective surgery is usually not recommended by ophthalmic specialists around the world.[74]
  • School myopia appears during childhood, particularly the school age years.[95]This form of myopia is attributed to the use of the eyes for close work during the school years.[68]A 2004–2015 Singapore–Sydney study of children of Chinese descent found that time spent on outdoor activities was a factor.[96]
  • Adult onset myopia
  • Early adult onset myopia occurs between ages 20 and 40.[74]
  • Late adult onset myopia occurs after age 40.[74]

Prevention and control

[edit]

Various methods have been employed in an attempt to decrease the progression of myopia, although studies show mixed results.[97]Many myopia treatment studies have a number of design drawbacks:small numbers,lack of adequatecontrolgroup, and failure tomask examinersfrom knowledge of treatments used. The best approach is to combine multiple prevention and control methods.[98]Among myopia specialists,mydriaticeyedrops are the most favored approach, applied by almost 75% in North America and more than 80% in Australia.

Spending time outdoors

[edit]

Some studies have indicated that having children spend time outdoors reduces the incidence of myopia.[99]A 2017 study investigated the leading causal theory of association between greenspace exposure and spectacles use as a proxy for myopia, finding a 28% reduction in the likelihood of spectacles use per interquartile range increase in time spent in greenspace.[100]In Taiwan, government policies that require schools to send all children outdoors for a minimum amount of time have driven down the prevalence of myopia in children.[99][101]

Glasses and contacts

[edit]

The use of reading glasses when doing close work may improve vision by reducing or eliminating the need to accommodate. Altering the use of eyeglasses between full-time, part-time, and not at all does not appear to alter myopia progression.[102][103]The American Optometric Association's Clinical Practice Guidelines found evidence of effectiveness of bifocal lenses and recommends it as the method for "myopia control".[74]In some studies, bifocal andprogressive lenseshave not shown differences in altering the progression of myopia compared to placebo.[97][104]

In 2019, contact lenses to prevent the worsening of nearsightedness in children were approved for use in the United States. This "MiSight" type claims to work by focusing peripheral light in front of the retina.[105]

Medication

[edit]

Anti-muscarinictopical medications in children under 18 years of age may slow the worsening of myopia.[106][107]These treatments includepirenzepine gel,cyclopentolate eye drops,andatropineeye drops.While these treatments were shown to be effective in slowing the progression of myopia, side effects included light sensitivity and near blur.[106][108]

Other methods

[edit]

Scleral reinforcement surgeryis aimed to cover the thinning posterior pole with a supportive material to withstandintraocular pressureand prevent further progression of the posterior staphyloma. The strain is reduced, although damage from the pathological process cannot be reversed. By stopping the progression of the disease, vision may be maintained or improved.[109]The use of orthoK can also slow down axial lens elongation.[110]

Treatment

[edit]
Glasses are commonly used to address myopia.

The National Institutes of Health says there is no known way of preventing myopia, and the use of glasses or contact lenses does not affect its progression, unless the glasses or contact lenses are too strong of a prescription.[111]There is no universally accepted method of preventing myopia and proposed methods need additional study to determine their effectiveness.[74]Optical correction usingglassesorcontact lensesis the most common treatment; other approaches includeorthokeratology,andrefractive surgery.[74]: 21–26 Medications (mostlyatropine) andvision therapycan be effective in addressing the various forms ofpseudomyopia.

Compensating for myopia using a corrective lens.

Glasses and contacts

[edit]
Prismatic color distortion shown with a camera set for near-sighted focus, and using –9.5dioptereyeglasses to correct the camera's myopia (left). Close-up of color shifting through corner of eyeglasses. The light and dark borders visible between color swatches do not exist (right).

Corrective lensesbendthe light entering the eye in a way that places a focused image accurately onto the retina. The power of any lens system can be expressed indiopters,thereciprocalof itsfocal lengthin meters. Corrective lenses for myopia have negative powers because a divergent lens is required to move thefar pointof focus out to the distance. More severe myopia needs lens powers further from zero (more negative). However, strong eyeglass prescriptions create distortions such as prismatic movement andchromatic aberration.Strongly myopic wearers ofcontact lensesdo not experience these distortions because the lens moves with the cornea, keeping the optic axis in line with the visual axis and because the vertex distance has been reduced to zero.

Surgery

[edit]

Refractive surgeryincludes procedures which alter the corneal curvature of some structure of the eye or which add additional refractive means inside the eye.

Photorefractive keratectomy

[edit]
See also:Photorefractive keratectomy

Photorefractive keratectomy (PRK) involves ablation of corneal tissue from the corneal surface using anexcimer laser.The amount of tissue ablation corresponds to the amount of myopia. While PRK is a relatively safe procedure for up to 6 dioptres of myopia, the recovery phase post-surgery is usually painful.[112][113]

LASIK

[edit]

In aLASIKpre-procedure, a corneal flap is cut into the cornea and lifted to allow the excimer laser beam access to the exposed corneal tissue. After that, the excimer laser ablates the tissue according to the required correction. When the flap again covers the cornea, the change in curvature generated by the laser ablation proceeds to the corneal surface. Though LASIK is usually painless and involves a short rehabilitation period post-surgery, it can potentially result in flap complications and loss of corneal stability (post-LASIKkeratectasia).[114][115]

Phakic intra-ocular lens

[edit]

Instead of modifying the corneal surface, as in laser vision correction (LVC), this procedure involves implanting an additional lens inside the eye (i.e., in addition to the already existing natural lens). While it usually results in good control of the refractive change, it can induce potential serious long-term complications such as glaucoma, cataract and endothelial decompensation.[116][117][118]

Orthokeratology

[edit]
Main article:Orthokeratology

Orthokeratology or simply Ortho-K is a temporary corneal reshaping process using rigid gas permeable (RGP) contact lenses.[119]Overnight wearing of specially designed contact lenses will temporarily reshape cornea, so patients may see clearly without any lenses in daytime. Orthokeratology can correct myopia up to -6D.[120]Several studies shown that Ortho-K can reduce myopia progression also.[121][122]Risk factors of using Ortho-K lenses include microbial keratitis,[121]corneal edema,[123]etc. Other contact lens related complications like corneal aberration, photophobia, pain, irritation, redness etc. are usually temporary conditions, which may be eliminated by proper usage of lenses.[123]

Intrastromal corneal ring segment

[edit]

TheIntrastromal corneal ring segment(ICRS), commonly used inkeratoconustreatment now, was originally designed to correct mild to moderate myopia.[124]The thickness is directly related to flattening and the diameter of the ring is proportionally inverse to the flattening of cornea. So, if diameter is smaller or thickness is greater, resulting myopia correction will be greater.[125]

Alternative medicine

[edit]

A number ofalternative therapieshave been claimed to improve myopia, includingvision therapy,"behavioural optometry", various eye exercises and relaxation techniques, and theBates method.[126]Scientific reviews have concluded that there was "no clear scientific evidence" that eye exercises are effective in treating myopia[127]and as such they "cannot be advocated".[128]

Epidemiology

[edit]

Global refractive errors have been estimated to affect 800 million to 2.3 billion.[129]The incidence of myopia within sampled population often varies with age, country, sex,race,ethnicity,occupation, environment, and other factors.[130][131]Variability in testing and data collection methods makes comparisons of prevalence and progression difficult.[132]

The prevalence of myopia has been reported as high as 70–90% in someAsiancountries, 30–40% in Europe and the United States, and 10–20% in Africa.[131]Myopia is about twice as common inJewish peoplethan in people of non-Jewish ethnicity.[133]Myopia is less common inAfricanpeople and associated diaspora.[130]In Americans between the ages of 12 and 54, myopia has been found to affectAfrican Americansless than Caucasians.[134]

Asia

[edit]
Estimated myopia rate in 20-year-olds in Asia.[135]

In some parts ofAsia,myopia is very common.

  • Singaporeis believed to have the highest prevalence of myopia in the world; up to 80% of people there have myopia, but the accurate figure is unknown.[136]
  • China's myopia rate is 31%: 400 million of its 1.3 billion people are myopic. The prevalence of myopia inhigh schoolin China is 77%, and incollegeis more than 80%.[137]
  • In some areas, such as China andMalaysia,up to 41% of the adult population is myopic to 1.00 dpt,[138]and up to 80% to 0.5 dpt.[139]
  • A study of Jordanian adults aged 17 to 40 found over half (54%) were myopic.[140]
  • Some research suggests the prevalence of myopia in Indian children is less than 15%.[141]

Europe

[edit]
Myopia rate in Europe by birth decade (1910 to 1970).[142]
  • In first-year undergraduate students in the United Kingdom 50% ofBritishwhites and 53% of British Asians were myopic.[143]
  • A recent review found 27% of Western Europeans aged 40 or over have at least −1.00 diopters of myopia and 5% have at least −5.00 diopters.[144]

North America

[edit]

Myopia is common in theUnited States,with research suggesting this condition has increased dramatically in recent decades. In 1971–1972, the National Health and Nutrition Examination Survey provided the earliest nationally representative estimates for myopia prevalence in the U.S., and found the prevalence in persons aged 12–54 was 25%. Using the same method, in 1999–2004, myopia prevalence was estimated to have climbed to 42%.[145]

A study of 2,523 children in grades 1 to 8 (age, 5–17 years) found nearly one in 10 (9%) have at least −0.75 diopters of myopia.[146]In this study, 13% had at least +1.25 Dhyperopia(farsightedness), and 28% had at least 1.00-D difference between the two principal meridians (cycloplegic autorefraction) ofastigmatism.For myopia, Asians had the highest prevalence (19%), followed by Hispanics (13%). Caucasian children had the lowest prevalence of myopia (4%), which was not significantly different from African Americans (7%).[146]

A recent review found 25% of Americans aged 40 or over have at least −1.00 diopters of myopia and 5% have at least −5.00 diopters.[144]

Australia

[edit]

InAustralia,the overall prevalence of myopia (worse than −0.50 diopters) has been estimated to be 17%.[147]In one recent study, less than one in 10 (8%) Australian children between the ages of four and 12 were found to have myopia greater than −0.50 diopters.[148]A recent review found 16% of Australians aged 40 or over have at least −1.00 diopters of myopia and 3% have at least −5.00 diopters.[144]

South America

[edit]

InBrazil,a 2005 study estimated 6% of Brazilians between the ages of 12 and 59 had −1.00 diopter of myopia or more, compared with 3% of the indigenous people in northwestern Brazil.[149]Another found nearly 1 in 8 (13%) of the students in the city ofNatalwere myopic.[150]

History

[edit]

The difference between the near-sighted and far-sighted people was noted already byAristotle.[151]Graeco-Roman physicianGalenfirst used the term "myopia" (from Greek words "myein" meaning "to close or shut" and "ops" (gen. opos) meaning "eye" ) for near-sightedness.[151]The first spectacles for correcting myopia were invented by a German cardinal in the year 1451.[152]Johannes Keplerin hisClarification of Ophthalmic Dioptrics(1604) first demonstrated that myopia was due to the incident light focusing in front of the retina. Kepler also showed that myopia could be corrected by concave lenses.[151]In 1632,Vopiscus Fortunatus Plempiusexamined a myopic eye and confirmed that myopia was due to a lengthening of its axial diameter.[153]

The idea that myopia was caused by theeye straininvolved in reading or doing other work close to the eyes was a consistent theme for several centuries.[101]In Taiwan, faced with a staggering rise in the number of young military recruits needing glasses, the schools were told to give students' eyes a 10-minute break after every half-hour of reading; however, the rate of myopia continued to climb.[101][154]The policy that reversed the epidemic of myopia was the government ordering all schools to have the children outside for a minimum of 80 minutes every day.[154]

Society and culture

[edit]

The terms "myopia" and "myopic" (or the common terms "short-sightedness" or "short-sighted", respectively) have been usedmetaphoricallyto refer to cognitive thinking and decision making that is narrow in scope or lacking in foresight or in concern for wider interests or for longer-term consequences.[155]It is often used to describe a decision that may be beneficial in the present, but detrimental in the future, or a viewpoint that fails to consider anything outside a very narrow and limited range.Hyperopia,the biological opposite of myopia, may also be used metaphorically for avalue systemormotivationthat exhibits "farsighted" or possiblyvisionarythinking and behavior; that is, emphasizing long-term interests at the apparent expense of near-term benefit.[156]

Keeping children indoors, whether to promote early academic activities, because urban development choices leave no place for children to play outside, or because people avoid sunlight because ofa preference for lighter skin color,causes myopia.[101]Taiwanhas developed an aggressive program to identify pre-school-age children with pre-myopia and treat them withatropine,and to have schools send students outdoors every day.[101]TheTian-tian 120program ( "Every day 120" ) encourages 120 minutes of outdoor time each day.[101]Compared to the cost of lifelong treatment for myopia with glasses, and in some cases, preventable blindness, the US$13 spent on screening young children for pre-myopia is considered a good investment inpublic health.[101]

Because myopia can be mitigated through lifestyle choices, it is possible that being myopic will become a marker of an impoverished or neglected childhood, with wealthy families ensuring that their children spend enough time outdoors to prevent or at least reduce it, and poor families, who rely on lower-quality childcare arrangements or not having access to a safe outdoor space, being unable to provide the same benefits to their children.[101]

Correlations

[edit]

Numerous studies have found correlations between myopia, on the one hand, and intelligence and academic achievement, on the other;[157]it is not clear whether there is acausal relationship.[158]Myopia is also correlated with increasedmicrosaccadeamplitude, suggesting that blurred vision from myopia might cause instability infixational eye movements.[159][160]

See also

[edit]

References

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