Ch 25. Minimal Visual Loss, the role of the cornea.

Question 1

Define Corneal Warpage

Answer 1

Corneal warpage is defined by a distortion of the corneasecondary to contact lens wear. This is expected to occur when the contact lens to cornea relationship is not optimal, especially when the corneal tissue is severed by chronic hypoxia.

Question 2

Further correction after best refractive correction sugests what?

Answer 2

Irregular astigmatism

Question 3

Presentation of PMD

Answer 3

Progressive, marked ATR astigmatism in a patient 20-40 years of age.

Question 4

How is the astigmatism in Terriens Marginal Degeneration

Answer 4

Since the peripheral thinning ussually superior, there is a central flattening in the vertical meridian, with marked steppening in the superior periphery.

therefore is ussually ATR astigmatism.