Slit Lamp Mechanics Flashcards
What are the 3 major “systems” of the slit lamp
- Patient housing
- Viewing system
- illumination system
What composes the viewing sytem
- oculars
- microcope arm
- joystick
- magnification
what composes the illumination system
- filters
- illumination width
- height
what is composed of the patient housing
- chin rest
2. forehead band
What corresponds to coarse focus
moving the entire assembly
what corresponds to fine focus
moving the joystick
The higher the number the ___ intensity the light has
less
What are the 6 illumination techniques
- Diffuse/wide beam
- Direct
- Indirect/Proximal
- Retro illumination
- Specular Reflection
- Sclerotic Scatter
What are the two most common beams used for general evaulation
wide and direct
What are the three types of direct illumination
- Paralellpiped
- Optic section
- Conical beam
Describe the path of light hitting the eye
- tears
- cornea
- AC
- Iris
- Lens
- Vitreous chamber
- Retina
What is optic section valuable for
Viewing depth/all layers of the cornea
When do you need MORE light
To study the cornea, lens, AC and anterior vitreous
what does the slit lamp out of lock help to identify
where you are in the eye; elevations and subtle abnormalities
If beam is coming from left what does the examiner see
- tear film
- corneal epithelium
- stroma
- endothelium
- AC
- Iris
