KERATOCONUS (Conical Cornea)

Keratoconus - a form of corneal dystrophy affecting the central part
of the cornea. It is usually bilateral though frequently one eye is more
involved than the other. The chief symptom is decreased visual acuity
for far and near caused by marked astigmatism which is usually irre-
gular. Placido's disc can be used to demonstrate the distortion of the
corneal reflection. Glasses may be used to correct the astigmatism
when it is mild. Contact lenses provide a regular anterior curvature to
improve vision. A corneal graft may be necessary when vision cannot
be corrected adequately by glasses or contact lenses, but glasses or
contact lenses are often necessary to correct vision after grafting.