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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 be used
Using the Rx below – A rigid contact lens fit “on K” would require which of the following powers?   Rx – 3.50 + 1.25 x 90   K: 42.00 x 180/43.75 x 90
The power of the tear lens in the previous questions is
Rx – 2.25 – 0.25 x 180Â Â Â Â 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
The normal cornea is essentially spherical in shape, and it
Refractive surgeries require
Which of the following is not a sign or symptom of keratoconus
The keratometer measurement can be extended to what range
Toric contact lenses may be indicated when
Every toric lens will
What attachment to the slit lamp can measure lens rotation
An aspheric back surface lens can aid in stabilization by
Which of these is a benefit of a toric contact lens
When is it beneficial to wear spectacles over contact lenses