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________________astigmatism cannot be corrected by spectacle lenses.
In ______________________astigmatism the cornea is steeper in the vertical meridian and flatter in the horizontal
In ______________________astigmatism the cornea is steeper in the horizontal meridian and flatter in the vertical.
In simple myopic astigmatism:
In simple hyperopic astigmatism:
In compound myopic astigmatism:
In compound hyperopic astigmatism:
In mixed astigmatism:
When are bitoric lenses prescribed?
For which of the following could prism ballast lenses be used:
Rx: -3.50 +1.25 x 90
K: 42.00 x 180/43.75 x 90
A rigid contact lens fit “on K” would require which of the following powers?
The power of the tear lens in the previous questions is:
Rx: -2.25 -0.25 x 180
What is the power of a rigid contact lens fit 0.75 diopters steeper than K?
The power and thickness of the lacrimal lens will vary with the:
The rotation of a toric contact lens may be inhibited by:
When a lens is ___________a portion of it is sectioned off.
The expression LARS stands for:
Astigmatic contact lenses may be classified into the following categories:
_______________________maintain their shape on the eye and don’t conform to the unequal contours of an astigmatic cornea
The tear lens behind the RGP contact lens :
Residual astigmatism may be caused by:
Anterior toric contact lenses with spherical back surfaces:
Posterior base curve toric lenses
When a rigid lens is fit on K the tear lens:
When a rigid lens is fit steeper than K the tear lens:
When a rigid lens is fit flatter than K the tear lens:
Astigmatism is:
______________is used for the correction of astigmatism
______________________astigmatism can be caused by a diseased or damaged cornea
Axis is always recorded as angle in degrees between ______and __________degrees.