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 Abbe number
absorptance
absorptive lens
Active ophthalmic instrument
addition power
additive power trial case lens set
Adjusting rail
afocal lens
aid microscope
aid telescope
alignment reference marking
angular magnification
antireflection coating
apex
apical angle
Arm
aspheric lens
aspherical surface
astigmatic difference
astigmatic effect
astigmatic lens power
Astigmatic power lens
astronomical telescope
atoric lens
atoroidal surface
auxiliary beam
Auxiliary lenses
"as-worn" power
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