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 second principal meridian
segment
segment centre
segment depth
segment diameter
segment extreme point
segment extreme point height
segment extreme point position
segment height
segment lens
segment side
segment width
semifinished lens blank
shape factor
side
single-vision lens
single-vision semifinished lens blank
Slit-lamp microscope
spatial resolution
spectacle lens
spectacle magnifier
spectacle microscope
spectacle telescopes
Spectral radiance L l (l)
spectral reflectance
spectral transmittance
Spectrally-weighted photochemical aphakic source radiance LA
Spectrally-weighted photochemical phakic source radiance LB
sphere
spherical lens
spherical power
Spherical power lens
spherical surface
Spherical test lenses
spherocylindrical lens
Spot retinoscope
stand magnifier
static perimeter
stimulus duration
stimulus luminance, LS
straight-top bifocal
straight-top segment
Streak retinoscope
supraliminal strategy
suprathreshold strategy
surface astigmatic power
surface power
Synoptophore
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