PAL and OPL
Quiz by Ling
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10 questions
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- Q1To maximise the usable areas on an PAL,(key hole effect), the PAL alignment to the eyes ideally would be8 mm of vertex distance8-10 degree of panto tilt20 degree of panto tilt20 mm vertex distance30s
- Q2A PAL with near add of +1.50 has _______ distortion than one with near add of +2.50.lessequalmore30s
- Q3Dist zone power: -4.25/-0.50x90 Near zone power: -2.50/-0.50x90 Near add=+2.00+1.75-1.75+0.7530s
- Q4The bigger the power range for an OPL, the _____ the corridor.widershorternarrower30s
- Q5The _________ the power range of an OPL, the further the wearer can see at primary gaze.smallerbigger30s
- Q6The minimum B dimension of a frame meant for PAL/OPL would be15 mm20 mm25 mm35 mm30s
- Q7A PAL wearer who has to adopt chin down posture to see dist objects clearly. The fitting cross istoo lowtoo high30s
- Q8A PAL wearer has to adopt excessive chin up posture to read. The cause could befitting cross too lowvertex distance excessiveinsufficient pantofitting cross too high45s
- Q9A _______ PAL wearer adopts chin up posture to see distant objects. He is likely to behyperopic, overcorrectedmyopic, undercorrectedhyperopic, undercorrected45s
- Q10An ______ is a PAL lens with low near addition can be used by non-presbyopic wearer.aspheric lensiseikonic lensanti-fatigue lens45s
