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The refractive astigmatism indicated by the RX
+1.50 -1.75 x 35 is
Mixed
The patient's RX is -1.75 -.50 x 120 with a +2.00 ADD standard trifocal.
What is the power through the intermediate?
-.75 -.50 x 120
The Geneva lens measure is designed to measure
Lens curvature
The focal length of a +5.00 diopter lens is
20 cm
,The problem of prismatic imbalance at the reading level is called
Anisometropia
Which of the following indicated the most acute distance vision?
20/15
Which of the following is not a potential correction for vertical balance?
Vertex Compensation
The ability of the eye to focus on objects at varying distances is known
as
Accomodation
Anisekonia is due to
Unequal size retinal images
,The corner of the eye where the upper and lower lids meet is the
Canthus
A ptosis crutch is used to
Drooping lid
In neutralizing a lens of unknown power your first reading is +1.00 the
next reading that focuses the cylinder target is -.25. What is the RX?
+1.00 -1.25
A +2.00 lens decentered in 5 mm beyond the patient's measured pd will
create
1 diopter base in prism
Which of the following conditions is indicated by the following RX:
O.D. +1.00 -1.00 x 180
O.S. -2.00 -.50 x 45
Antimetropia
, The loss of vision without any apparent defect to the eye is called
Amblyopia
The ANSI cylinder tolerance for a -.25 cylinder is
Plus or minus 7 degrees
Which of the following has no power in the 180 degree meridian?
+2.00 -2.00 x 90
All specifications being equal which of the following materials will yield
the thinnest lens?
Polycarbonate
If the right temple is angled up the effect on the frame will be to
Lower the right side