T
- telemicroscope
- terms relating to transmission, reflection and coatings
- terrestrial telescope
- test stimulus
- test stimulus pattern
- test tonometer
- threshold differential luminance, DLT
- threshold stimulus luminance, LT
- Threshold strategy
- tinted lens
- toric lens
- toroidal surface
- tracer
- trademark
- transmittance in the infrared A
- transmittance in the infrared B
- transmittance in the solar infrared spectrum
- transmittance in the solar ultraviolet A spectrum (SUVA)
- transmittance in the solar ultraviolet B spectrum (SUVB)
- transposition
- trial case lens
- trial frame
- trifocal lens
threshold differential luminance, DLT
Difference between the threshold stimulus luminance LT and the background luminance DLT = LT - LB