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17/09/2013
0
MEASURING VERTEX DISTANCE (PUPILLOMETER)  USING A PUPILLOMETER This method sometimes works if the pupillometer can get close enough to the eye so the image is not too blurred. To help, pull back the forehead bar. Set the distance dial to infinity. Move the thumb slides to the temporal most direction, look at the value in mm (will be about 38.5mm).  ..
17/09/2013
0
MEASURING VERTEX DISTANCE (MM RULER)  When wearing glasses, the distance from the front of the cornea to the back surface of a lens is called the Vertex Distance. Why is this measurement important? Prescription lenses in eyeglass frames have different effective powers at different distances, tilts and wrap angles from the eye. That mean..
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