What is Keratoconus?

Is a vision disorder that occurs when the normally round cornea (front part of the eye) becomes thin, irregular and cone-shaped. This abnormal shape prevents the light entering the eye from being focussed correctly on the retina and causes distortion of vision. Hard contact lenses are the mainstay of treatment but are usually not well tolerated. Specialised Hybrid lenses are now available today to give keratoconic patients crisp clear and comfortable vision.

Keratoconus Symptoms And Signs

As the cornea becomes more irregular in shape, it causes progressive nearsightedness and irregular astigmatism to develop, creating additional problems with distorted and blurred vision. Glare and light sensitivity also may occur.

Often, keratoconic patients experience changes in their eyeglass prescription every time they visit their eye care practitioner.

What Causes Keratoconus?

Normal eye vs. eye with keratoconus
[Enlarge]

New research suggests the weakening of the corneal tissue that leads to keratoconus may be due to an imbalance of enzymes within the cornea. This imbalance makes the cornea more susceptible to oxidative damage from compounds called free radicals, causing it to weaken and bulge forward.

Risk factors for oxidative damage and weakening of the cornea include a genetic predisposition, explaining why keratoconus often affects more than one member of the same family.

Keratoconus also is associated with overexposure to ultraviolet rays from the sun, excessive eye rubbing, a history of poorly fitted contact lenses and chronic eye irritation.

Useful link:  All about Vision 

 

 

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