| Aphakia | |
|---|---|
| Classification and external resources | |
| ICD-10 | H27.0, Q12.3 |
| ICD-9 | 379.31, 743.35 |
| OMIM | 610256 |
| DiseasesDB | 29608 29607 |
| MeSH | D001035 |
Aphakia is the absence of the lens of the eye, due to surgical removal, a perforating wound or ulcer, or congenital anomaly. It causes a loss of accommodation, hyperopia, and a deep anterior chamber. Complications include detachment of the vitreous or retina, and glaucoma.
Aphakic people are reported to be able to see ultraviolet wavelengths that are normally excluded by the lens.[1] This may have had an effect on the colors perceived by artist Claude Monet, who had cataract surgery in 1923.[2]
Babies are rarely born with aphakia. Occurrence most often results from surgery to remove congenital cataracts (clouding of the eyes' lens, which can block light from entering the eye and focusing clearly). Congenital cataracts usually develop as a result of infection of the fetus or genetic reasons. It is often difficult to identify the exact cause of these cataracts, especially if only one eye is affected.
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The eye becomes highly hypermetropic and total power of eye is reduced. This results in a total loss of accommodation.
Causes: 1. Congenital- It is rare. It can be grouped as Primary (failure of development of lens in foetal life) and Secondary (Lens forms but gets absorbed in-utero due to some factors). 2. Surgical- following cataract surgery. 3. Trauma- common in children. 4. Posterior dislocation of lens in vitreous.
Aphakia could be corrected by wearing glasses, contact lenses or by implant of an artificial lens (pseudophakia). Optical principle- correct the error by convex lens of appropriate power, so that the image is formed on retina.
3.Notes of Shishir Pokhrel
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