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The Pupillary Distance
The Final Fit
22 other sections not shown
90 degrees Alec Taylor angle anti-reflection coating aperture astigmatism axis base-down bevel bifocal blank bridge Calculation centimetres centration chromatic aberration coating colour cornea correct crown glass curve cylinder decentration deviation diameter differential prism diopters dispensing distance lens distance vision drill edge Essilor finished lens flat focal length focimeter front surface give glass glazed groove high-powered hinge hole horizontal Igard inset intermediate segment joint left lens lens Figure lens power lens shape lenticular lenticular Figure light look machine main lens marked measure millimetres minus lenses Mitre joint nanometres neutralize normal nose nylon optician patient pinning plano plastics material pliers point sphere position power diagram Prism due produce pupillary distance rays reading addition reading lens reading segment receptionist refractive refractive index retina right lens round side solder spectacle frame spherical thickness tint Total prismatic effect trifocal uncut Varilux wavelength workshop