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ABO-NCLE practical Exam questions with correc
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ABO-NCLE practical Exam questions with correcThe advantages aphakia have over spectacle lenses - ANSWER Less peripheral
aberration
Less magnification
Increase visual field
not having a lens inside your eye - ANSWER Aphakia
Which of the following can aphakia cause, myopia or hypermetropia? - ANSWER
Hypermetropia
Causes of aphakia - ANSWER *Congenital absence of lens
*Surgical Aphakia
*Absorption of lens matter
*Traumatic extrusion (push or forced out)
*Posterior dislocation- in vitreous, causes optical aphakia
The cornea thins and bulges outward into a cone shape - ANSWER Keratoconus
Symptoms of Keratoconus - ANSWER *distorted, blurred, double vision
*inability to see dim light
*sensitivity to light
Signs of keratoconus - ANSWER CORNEAL THINNING AT THE APEX
CHANGES OF ASTIGMATISM
DECREASING VISION IN ONE EYE
cause of keratoconus - ANSWER Cause is unknown, but it is believed to be
present at birth or the loss of collagen in the cornea
How can be keratoconus be treated? - ANSWER *Surgical treatment
*Vision correction
*specialty contact
*Corneal cross link
Slows down and stop the progression of keratoconus but doesn't improve vision -
ANSWER Cornea Cross Linking
A conical shaped cornea can best be fit with contact lenses through the use of:
A.trial lenses
B. keratometer readings
C. eye impressions
D. topogometer readings - ANSWER A. Trial lenses
, Prism ballast lenses can be useful for: - ANSWER For cylindrical lenses and some
bifocals
Helping to reduce lens rotation
What type of contacts needs prism ballast? - ANSWER Front surface toric GP and
bifocal/multifocal GP
What type of contacts does not need prism ballast - ANSWER Back surface toric,
Bitoric, and Spherical lenses
Base down prism from 0.75-1.5 diopters weighs the lens down and keeps it stable so
it doesn't rotate - ANSWER Prism ballast
Bitoric lenses are prescribed:
A. Only when there is a small amount of corneal
B. Astigmatism and no residual when there 1s no corneal
C. Astigmatism only for bifocal contact lenses
D. When there is at least 2.00D of corneal astigmatism accompanied by a significant
amount of residual astigmatism - ANSWER D. When there is at least 2.00D of
corneal astigmatism accompanied by a significant amount of residual astigmatism
In which of the following cases would a front toric lens most likely be prescribed?
A. K: 41.00@180/41.25@090
Rx: -1.25 - 0.25 x 090
B. K: 41.25@175/42.50@085
Rx: -2.75 -1.00 x 005
C. K: 43.25@165/43.37@075
Rx: -4.00 -0.75 x 165
D. K: 42.00@180/42.000@090
Rx: -1.25 -3.75 x 180 - ANSWER D. K: 42.00@180/42.000@090
Rx: -1.25 -3.75 x 180
K: 41.50@090/42.75@180 This K reading indicates:
A. With the rule astigmatism
B. Against the rule astigmatism
C. Oblique astigmatism
D. Residual astigmatism - ANSWER B. Against the rule astigmatism
Rx: -4.50 + 2.50 x 095
Transposed - 2.00 - 2.50 x005
K: 44.75@090/45.00@180
What type of lens would best fit this patient?
A. Spherical contact lens
b. bitoric contact lens
C. front toric contact lens
D. Monovision - ANSWER C. Front toric contact lens
Early stages of keratoconus may be detected through the use of :
A. Slit lamp
B. Radiuscope
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