The eye functions in a similar way to a camera. The cornea at the
front of the eye is compareable with a camera lens and provides most of
the eye focusing power, whereas the retina at the back of eye works
as a film. For us to see clearly light rays must pass through the cornea
and focus on the single point on the retina.
Occurs when eye is either too long or the cornea is more curved than
normal. The condition causes light rays to focus at a point in front of the retina with the result that the objects in the distance appear blurred.
Occurs when the eye is either too short or the cornea too flat. Consequently light
focuses at a point behind the retina and close objects appear blurred.
Is a condition in which the cornea surface is irregular.
Depending upon the severity sufferers find that objects appear elliptical.
Cornea becomes opaque thereby blocking light from reaching the retina. This is corrected through a procedure known as PHOTOTHERAPEUTIC KERATECTOMY (PTK)
A disorder in which increased intraoccular pressure damages the nerve
is made to bring pressure within normal limits.
