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lens power measurement lensometer
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Lensometer
1.
Lensometer Presented By Asif
Faraz Nasir M.optom
2.
Definition • Meaning • 'Lenso'=lens •
'Metry'=measurement of
3.
Types 1.Manual,and 2.Automatic.
4.
Manual lensometer A simple
lensmeter cross sectional view. 1 – Adjustable eyepiece 2 – Reticle 3 – Objective lens 4 – Keplerian telescope 5 – Lens holder 6 – Unknown lens 7 – Standard lens 8 – Illuminated target 9 – Light source 10 – Collimator 11 – Angle adjustment lever 12 – Power drum (+20 and -20 Diopters) 13 – Prism scale knob
5.
Optics and basic
structure • also called conventional or manual lensmeter and operates on the principle of optometer • the optical principle of optometer developed by Badal is preferred over the non badal principle.