1|Page
ABO-NCLE PRACTICAL TEST EXAM 2024 ACTUAL EXAM COMPLETE 80
QUESTIONS WITH DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) ALREADY GRADED A+
Vertical Imbalance - CORRECT ANSWER >>>>The
difference in vertical prism power at the reading level in
a pair of lenses.
OC Height's by lens - CORRECT ANSWER >>>>SV = 1/2 of
B
Progressive = Fitting cross
FT = 5mm above segment
Vertex Compensation - CORRECT ANSWER >>>>A plus
lens when moved farther from the eye gains in plus
power
Distance is 0 with CL because they are on the eye
Vertex compensation Formula - CORRECT ANSWER
>>>>De= Dl/(1 + d xDl)
, 2|Page
De= diopter effective value of error created
D/= lens power (given power)
d= amount in METERS lens moved from refracted
position to position lens is worn
Keep sign for what it is (+/-)
- to d means moves away
Horizontal Centration - CORRECT ANSWER >>>>PD
Vertical Centration - CORRECT ANSWER >>>>OC
Horizontal & Vertical Centration Formula - CORRECT
ANSWER >>>>Given PD/OC - Human PD/OC= mm moved
Frame PD is found by adding A+DBL
Power in Oblique Meridians - CORRECT ANSWER >>>>Dt=
(sina)²x Dc +Ds
Dt= Total Power we need
(sina)²= degree we have degree we need
Dc= cylinder power
Ds= sphere power
Lensmeter - CORRECT ANSWER >>>>is an ophthalmic
instrument. It is mainly used by optometrists and
opticians to verify the correct prescription in a pair of
eyeglasses, to properly orient and mark uncut lenses, and
ABO-NCLE PRACTICAL TEST EXAM 2024 ACTUAL EXAM COMPLETE 80
QUESTIONS WITH DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) ALREADY GRADED A+
Vertical Imbalance - CORRECT ANSWER >>>>The
difference in vertical prism power at the reading level in
a pair of lenses.
OC Height's by lens - CORRECT ANSWER >>>>SV = 1/2 of
B
Progressive = Fitting cross
FT = 5mm above segment
Vertex Compensation - CORRECT ANSWER >>>>A plus
lens when moved farther from the eye gains in plus
power
Distance is 0 with CL because they are on the eye
Vertex compensation Formula - CORRECT ANSWER
>>>>De= Dl/(1 + d xDl)
, 2|Page
De= diopter effective value of error created
D/= lens power (given power)
d= amount in METERS lens moved from refracted
position to position lens is worn
Keep sign for what it is (+/-)
- to d means moves away
Horizontal Centration - CORRECT ANSWER >>>>PD
Vertical Centration - CORRECT ANSWER >>>>OC
Horizontal & Vertical Centration Formula - CORRECT
ANSWER >>>>Given PD/OC - Human PD/OC= mm moved
Frame PD is found by adding A+DBL
Power in Oblique Meridians - CORRECT ANSWER >>>>Dt=
(sina)²x Dc +Ds
Dt= Total Power we need
(sina)²= degree we have degree we need
Dc= cylinder power
Ds= sphere power
Lensmeter - CORRECT ANSWER >>>>is an ophthalmic
instrument. It is mainly used by optometrists and
opticians to verify the correct prescription in a pair of
eyeglasses, to properly orient and mark uncut lenses, and
