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
dimensions of lens blanks or lenses
Nominal size dn: Dimension indicated by the manufacturer. Effective size de: Actual dimension of the blank or lens. usable size du: Dimension of the area that is optically usable.