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Picture of the back of the eye showing intermediate age-related macular degeneration: Specialty: Ophthalmology, optometry: Symptoms: Blurred or no vision in the center of the visual field [1] Complications: Visual hallucinations [1] Usual onset: Older people [1] Types: Early, intermediate, late [1] Causes: Damage to the macula of the retina [1 ...
There is some confusion over how the focusing mechanism of the eye works. [clarification needed] In the 1977 book, Eye and Brain, [13] for example, the lens is said to be suspended by a membrane, the 'zonula', which holds it under tension. The tension is released, by contraction of the ciliary muscle, to allow the lens to become more round, for ...
There are many diseases known to cause ocular or visual changes. Diabetes , for example, is the leading cause of new cases of blindness in those aged 20–74, with ocular manifestations such as diabetic retinopathy and macular edema affecting up to 80% of those who have had the disease for 15 years or more.
This is a partial list of human eye diseases and disorders. The World Health Organization (WHO) publishes a classification of known diseases and injuries, the International Statistical Classification of Diseases and Related Health Problems , or ICD-10.
Diabetes is the most common cause of retinopathy in the U.S. as of 2008. [4] Diabetic retinopathy is the leading cause of blindness in working-aged people. [5] It accounts for about 5% of blindness worldwide and is designated a priority eye disease by the World Health Organization. [6]
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.