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
Monocular indirect ophthalmoscope
A monocular ophthalmoscope which provides an illumination system and which is used with a condensing lens (hand-held or integral) in order to direct appropriately focused light into the patient's eye. Such instruments may provide corrective lens(es) or eyepieces to aid focusing by the observer of the real intermediate image produced by the condensing lens.