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
The ratio of the viewing angle of an object when observed through a magnifying system with the image at infinity to that of the object when observed by the naked eye at a reference viewing distance of 250 mm. NOTE1: The magnification, G, can be calculated using the following equation: Formel! where s ' is the angle at which an object is seen through the microscope; s is the angle at which the same object is seen without any instrument at a viewing distance of 250mm. NOTE2: The magnification of the microscope comprises the magnification of the complete system.