1.During A-scan biometry, a one diopter IOL power error could
result from an axial length error of:
a. 0.04 m
b. 0.4 mm
c. 1 mm
d. 4 mm
e. 8mm
..
2. During A-scan biometry, corneal compression from excessive
pressure from the probe will:
a. have no affect on the measurement
b. cause an artificial shortening of the axial length
c. cause an artificial lengthening of the axial length
d. distort the lens
e. damage the probe
..
3. Corneal compression can be suspected by comparing the
following readings between scans:
a. anterior chamber depth
b. corneal thickness
c. iris thickness
d. lens thickness
e. posterior chamber depth
.
4. Which formula is considered to be most accurate for eyes
between 22 and 26 mm long?
a. Holladay
b. Hoffer Q
c. SRK/T
d. SRK
e. regression
.
5. During a cataract operation, there was posterior capsule rupture
and an intraocular lens has to be implanted in the sulcus (assuming
the power was not changed). This will result in:
a. no change in the post-operative power
b. myopic shift
c. with-the-rule astigmatism
d. hypermetropic shift
e. irregular astigmatism
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