M
- Magnification
- Magnification of photography
- magnifier
- main beam
- main lens
- major portion
- major reference point
- Manufacturer
- margin
- matching lens
- mean reflectance
- mean transmittance in the ultraviolet A spectrum TUVA
- measured IOP
- measured power
- meniscus lens
- meridian of a lens
- meridian of a surface
- meridional power
- metal frame
- mineral glass
- minus-power lens
- monocular aid
- monocular field
- Monocular indirect ophthalmoscope
- monocular pupillary distance
- multifocal lens
- multifocal semifinished lens blank
Magnification of photography
Ratio of the size of the image on the photosensitive target to that of the fundus at the centre of the photographic field, assuming that the eye is emmetropic and that it has a focal length of 17 mm in air.