The slit lamp bio microscope has three main systems: the observation system which uses lenses and eyepieces, the illumination system which provides different methods of lighting including diffuse, direct focal, indirect and retro illumination, and the mechanical system which controls movement. It can be used to examine the inner eye using specialized lenses and measure intraocular pressure with a Goldman applanation tonometer. Various apertures like diffusers and color filters are available to control the type of light.

1. Slit lamp bio
microscope
LECTURE NO (4)

2. Components:
Observation system
Illumination system
Mechanical system
Optical principle
Objective lens
Eyepiece

4. Inner eye technique:
 Inner eye technique:
 Hruby lens
 90.00 D lens
 Three mirror lens
 Intra ocular pressure:
 Goldman a planation tonometer

9. Apertures:
Diffuser
Cobalt blue
Red free
Neutral density
Yellow filter

10. Illumination methods:
 Diffuse illumination
 Direct focal illumination
1. Parallel piped
2. Optic section
 Indirect illumination
 Retro illumination
 Sclerotic scatter
 Specular reflection