OCPP volume 3 Questions With Complete
Solutions
The term lensometer is a generic term. The correct name for the instrument is Focimeter
Rather than actually reading the power of the lenses, what are we really doing? We are
neutralizing the power of the lens by measuring the focal length. The ...
The term lensometer is a generic term. The correct name for the instrument is Focimeter
Rather than actually reading the power of the lenses, what are we really doing? We are
neutralizing the power of the lens by measuring the focal length. The instrument converts focal
length to dioptric power
When viewing through the eyepiece, as you move a lens to the right the image also goes to the
right, what type of lens is it? Minus power-with motion
When neutralizing a pair of eyewear in a lensometer, the first thing you should do is?
Focus the eyepiece. With the instrument off, place a white piece of paper on the lens stop. Rotate
the eyepiece quite a bit to the left and then slowly rotate to the right. When the mires are clear,
stop
The image in the lensometer has both sphere and cylinder lines in focus... This illustrates
a sphere power
, OCPP volume 3 Questions With Complete
Solutions
The image in the lensometer has only the sphere lines in focus but not the cylinder This
indicates a sphero/cylindrical power
The image in the lensometer has both sphere and cylinder lines in focus but are off center. This
represents? It is a spherical power lens. Because the lines are off center and above the
center we can read the amount of prism
If you are neutralizing a lens and get the sphere lines clear at +3.00 at 180 and the cylinder lines
clear at +1.00, what is the power of the lens? +3.00-2.00x180
If you are neutralizing a lens and get the sphere lines clear at +2.50 at 45 degrees and the
cylinder comes in clear at -1.00 what is the power of the lens? +2.50-3.50x045
If you are neutralizing a pair of single vision glasses and you center the mites on the OD and
when you move to the OS the target is below center, what should you do? Identify which
lens is stronger and center that one first, then switch to the opposite lens to determine how much
prism is in the lens
, OCPP volume 3 Questions With Complete
Solutions
If you are neutralizing a single vision lens and the first image comes in clear at -4.50 at 90 and
the second one comes in at -5.50 what is the power of the lens? -4.50-1.00x090
If you are neutralizing a lens and the first image comes in clear at -4.50 at 90 and the second
image comes in clear at -3.50 what is the power of the lens? -4.50+1.00x090
Explain how to neutralize the power of a multifocal Neutralize the distance just as you
would for single vision. To determine the add power turn the lens around and read the sphere
power. Then move to the segment and read the sphere power. The difference between the two is
the add power
If you are neutralizing a multifocal lens and the lines come into focus at +2.50@145 and the
cylinder lines at +1.00 and then when you move down to the segment the two readings are +5.00
and +3.50 what is the power of the lens? The power of the lens is +2.50-1.50x145 add is
+2.50 It is not necessary to see the focus for the cylinder
Why do colors look different in fluorescent light? Fluorescent lights have little red and
cause objects to reflect more blue green
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