Test 2
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
Return to Part 1 FRCOphth / Next Test