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D
- D-segment
- decentration
- depth perception
- design reference point
- differential light sensitivity, S
- differential luminance, DL
- digitally rounding focimeter
- dimensions of lens blanks or lenses
- dioptre
- dioptric power
- Direct ophthalmoscope
- dispersion
- display magnification
- display size
- distance cap
- Distance dependent ophthalmometer
- distance design reference point
- distance optical centre
- distance portion
- distance portion curve
- distance reference point
- distance visual point DVP
- diverging lens
- dividing line
design reference point
That point or those points, stipulated by the manufacturer, on the finished surface of a lens blank or on the front surface of the finished lens, at which the design specifications apply. NOTE: Examples are the distance design reference point and the near design reference point.