Unit 7

Question 1

What causes corneal warpage?

Answer 1

Poor fit
-Excessive movement
– eccentric location.
– localized heavy bearing
Long-term PMMA wearer

Question 2

What are symptoms of corneal warpage?

Answer 2

Blurry vision even with glasses
-Still experiences blurry vision, even when the lenses are removed

Question 3

How to treat corneal warpage?

Answer 3

with new material, maybe he needs a toric of some sort. Otherwise just refit like normal once cornea is back to normal after about a month.

Question 4

What is GP lens warpage?

Answer 4

-GP lens gets twisted or bent out of shape.
– creates permanently induced toricity within the lens

Question 5

What are causes for a lens warpage?

Answer 5

-Storing a lens in a hot environment like a car.
– aggressive rubbing while cleaning

Question 6

What is lens flexure?

Answer 6

The bending of a GP lens while on the eye

Question 7

What causes lens flexure?

Answer 7

-Corneal astigmatism, greater than 1.50
-Steep lens
-Centre of lens is too thin

Question 8

How to fix lens flexure

Answer 8

-Flatten the lens.
– increase thickness.
– fit a back surface toric, or bitoric lens

Question 9

How can we tell if it’s lens warpage, or flexure?

Answer 9

In addition to all other measures, the radiuscope will show toricity