ANATOMATICAL CONSIDERATIONS IN LENS CHOICE

Sometimes the patients ocular anatomy dictates the lens choice.

If the patient has a distorted cornea 
the only lens type that may give 
acceptable vision is a rigid lens.  
Since the rigid lens masks the 
distortion by allowing the tear layer 
to neutralize it, the front of the lens 
becomes the new, regular front 
refracting surface of the eye.

A hydrogel lens will conform to the 
irregular surface with no significant 
tear layer to neutralize the 
distortion, therefore, the vision is 
not significantly improved.

Patients with corneal distortion from 
trauma, disease, surgery, keratoconus 
or other causes usually are best fit with rigid lenses.