Vision disorder

Vision disorder
Disability-adjusted life year for vision disorders (age-related) per 100,000 inhabitants in 2002. [1]   no data   less than 100   100–200   200–300   300–400   400–450   450–500   500–600   600–700   700–750   750–800   800–850   more than 850
Specialty	Ophthalmology

A vision disorder is an impairment of the sense of vision.

Vision disorder is not the same as an eye disease. Although many vision disorders do have their immediate cause in the eye, there are many other causes that may occur at other locations in the optic pathway.

Causes

There are many eye conditions that can lead to vision disorder. Some of which are as follows:

• Age-Related Macular Degeneration (ARMD): ARMD is a retinal degeneration disease specifically associated with macula blood vessels, which can result in central vision impairment. It is strongly linked to advancing age, as well as European ancestry. ^[2]
• Bulging eyes: where the eye (one or both) protrudes or distends out of its orbit. Left untreated, bulging eyes may lead to eye dryness, pain and vision loss ^[3]
• Cytomegalovirus (CMV) Retinitis: This is an inflammation of the retina caused by infection, which can result in blindness. It occurs in people experiencing suppressed immune systems, most commonly by Acquired Immunodeficiency Syndrome (AIDS). ^[4]
• Diabetic Macular Edema (DME): is an eye disease specifically related to diabetes, occurring due to fluid build-up in the retina as a result of sustained high blood glucose levels. It can result in blurred vision and vision loss. ^[5]
• Eye floaters and spots: where visible cloud-like images appear to "float" in an individual's field of vision. ^[6] Floaters and spots are most commonly related to ageing. They are generally harmless and do not cause blindness ^[7]
• Eye flashing: characterised by bursts or streaks of light that appear in an individual's field of vision. As eye flashing may indicate impending retinal detachment, medical attention is required. ^[8]
• Eyelid twitching: where the eyelid muscles contract in an irregular or abnormal pattern. Such movements can cause irritation and fatigue to the eyes. ^[9]
• Glaucoma: occurs when the optic nerve is damaged and can result in irreversible vision loss, with the potential to pass undetected until this damage occurs. It is caused when aqueous humour fails to adequately drain from the eye, resulting in pressure build-up. ^[10]
• Keratoconus: vision problems can be caused when the cornea thins and distorts into a conical shape. While the cause is unknown, Keratoconus is believed to be congenital, and can be exacerbated by allergies and eye rubbing. ^[11]
• Strabismus: where the muscular or neural control of gaze direction fails to align the eyes to a shared locus of visual attention, sometimes leading to double vision
• Uveitis: where the uveal (middle) layer of the eye is inflamed. Uveitis requires medical intervention as it can lead to blurry vision, eye pain, eye floaters, eye redness and vision loss ^{[12] [13]}

Epidemiology

It was estimated by the WHO in 2004 that 314 million people worldwide are vision impaired (from all causes), of whom 45 million are blind. ^[14] Vision disorders are not often targeted by public health initiatives, as mortality causes take priority. ^[15] However, they can have significant impact on a person's quality of life, affecting performance at school and the workplace if not corrected.

See also

• Blindness, Recovery from blindness
• Amblyopia, Nystagmus, Strabism, Stereoblindness, Stereopsis recovery
• Visual impairment
• Visual field

References

1. "Mortality and Burden of Disease Estimates for WHO Member States in 2002" (xls). World Health Organization. 2002.
2. "Age-related macular degeneration - EyeWiki". eyewiki.org. Retrieved 2020-01-23.
3. "Bulging Eyes – Symptoms and treatments for Bulging Eyes : Bausch + Lomb". www.bausch.com. Retrieved 2020-01-22.
4. "CMV Retinitis - EyeWiki". eyewiki.org. Retrieved 2020-01-23.
5. "Diabetic Macular Edema - EyeWiki". eyewiki.org. Retrieved 2020-01-23.
6. "Glossary of Common Eye & Vision Conditions". www.aoa.org. Retrieved 2020-01-22.
7. "Common Eye Problems and Infections". OnHealth. Retrieved 2020-01-22.
8. "Glossary of Common Eye & Vision Conditions". www.aoa.org. Retrieved 2020-01-22.
9. "Eyelid Twitching – Causes and Symptoms of Eyelid Twitches : Bausch + Lomb". www.bausch.com. Retrieved 2020-01-22.
10. "Glaucoma Treatment, Symptoms & Diagnosis". Lions Eye Institute. Retrieved 2020-01-23.
11. "Keratoconus: MedlinePlus Medical Encyclopedia". medlineplus.gov. Retrieved 2020-01-23.
12. "Uveitis – Symptoms and Treatments for Uveitis : Bausch + Lomb". www.bausch.com. Retrieved 2020-01-22.
13. "Glossary of Common Eye & Vision Conditions". www.aoa.org. Retrieved 2020-01-22.
14. Resnikoff S, Pascolini D, Mariotti SP, Pokharel GP (January 2008). "Global magnitude of visual impairment caused by uncorrected refractive errors in 2004". Bulletin of the World Health Organization. 86 (1): 63–70. doi:10.2471/BLT.07.041210. PMC   2647357 . PMID   18235892.
15. Ono K, Hiratsuka Y, Murakami A (September 2010). "Global Inequality in Eye Health: Country-Level Analysis From the Global Burden of Disease Study". American Journal of Public Health. 100 (9): 1784–8. doi:10.2105/AJPH.2009.187930. PMC   2920965 . PMID   20634443.