Poor vision that cannot be corrected fully with glasses may indicate a condition
known as conical cornea or keratoconus. A rare condition, keratoconus primarily
affects people in their early 20's.
With keratoconus,
the cornea, the
"clear window" at the front of the eye, may become thin and bow outwards.
It is this irregular distortion of the cornea that makes vision correction
with glasses less than optimal. For this reason other means of correcting vision
are often necessary.
Vision
correction with rigid gas permeable lenses.
Mild to moderate keratoconus is best corrected with rigid gas permeable
contact lenses, which provide a smooth surface in front of the cornea,
making clear vision possible. Because the lens is rigid, the tears between
the lens and the cornea form a 'liquid lens,' which smoothes the irregularities
of the cornea and makes clear vision possible again. Soft lenses, which
'wrap' onto the cornea and take up its shape much more closely than rigid
lenses, are less successful at correcting keratoconus.
Corneal replacement surgery may
be necessary.
As keratoconus progresses, some scarring of the cornea can occur. Eventually,
contact lenses may no longer be a successful treatment. Instead, the cornea
may need to be replaced surgically with a cornea of more regular shape. The
prognosis for corneal replacement surgery is generally very good. |
