What is Eye Topography?
In this field it refers to measurement of the contour of the front of the eye, the cornea. As the light enters the eye it is bent ,or refracted by the front layer,so it can focus on the back of the eye,the macula. Disruption to the shape of the front of the eye will determine how you can potentially see.
When would it be done?
Generally it is done, when during the course of the exam, we suspect an optical defect of the front of the eye. These surface defects can be a normal part of your development, or as per usual response may be not.
Corneal topographic instruments are utilised to measure progression of herniation of the cornea in conditions such as Keratoconus, post corneal graft patients, or most commonly when being fitted for contact lenses.