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Diplopia is defined as:
When a patient remarks that their new eyewear makes the floor seem farther away “like in a valley”:
For our purposes, Occam’s razor is:
Often, the dispenser must use his/her skills as an interpreter because:
Upon inspection it is determined that the new progressive multifocal eyewear is badly out of alignment: The left lens is approximately half an inch higher than the right. This could mean:
A simple corrective adjustment:
When inspecting “seg” heights:
When evaluating seg heights in PAL’s
Completely neutralizing the patient’s prior pair
When a long-term wearer of 8X35mm trifocals is switched to bifocals and announces “I can’t see the clock at the end of my desk!”
This same trifocal wearer
Two differing progressive lens designs are available from two different divisions of the same company. One design has a 2mm “drop” between center pupil fitting cross and the actual beginning of the progressive corridor, the other incorporates a 6mm drop. These variations
A patient whose previous PALs incorporated a 2mm drop was fit elsewhere with a new pair with a 6mm drop. By all measures, the new lenses perform admirably for both distance vision and reading, but the patient has a pronounced awareness of the differences in the intermediate portions. You may advise:
The O.S. lens in a pair of successfully worn FT 35mm bifocals needs to be replaced due to lens damage. It is recommended that:
It is crucial that a professional career dispenser knows how to calculate the power of a lens in the vertical meridian
Generally, as the index of refraction of a lens increases
A pair of spectacles is neutralized. When the O.C.s are spotted, the O.S. lens marks 4mm lower than the O.D. The result of this variance may be
Aspheric/atoric curves
When choosing a lens material for a new Rx
If a patient with a 3.00 diopter cylinder requires a prescription change that rotates her axis from 59* to 48*, it may mean that
A modified/adjusted prescription developed with the prescribers approval may include
A prescription reconfigured as described in the previous question