Slit Lamp Flashcards
Diffuse Illumination
Starting point
Direct illumination
- Gross assessment of the eye
- Low magnification
- Beam wide open
- 30° angle
Slit lamp
AKA biomicroscope
- Evaluates eye health, CL fit, IOP
- Can also aid in laser surgery
- Developed in 1800’s, came to US in 1920’s
- Developed by L. Koppe and Basil Grover (they taught its use)
Parallel Pipe
Direct Illumination
- Slightly wider than optic section
- Good for scanning cornea
- Start with LOW mag, can go up to medium/high
- Light at 30-60° angle
Optic Section
Direct Illumination
- Cross section of cornea/lens
- Thinnest beam possible
- 30-60° angle
- Mag set to medium
- Can see small details on cornea/puncta
- Shows location and depth of imbedded object
- Can see different layers of cornea
Specular Reflection
Direct Illumination
- Used to view endothelium and tear layer
- Light and oculars positioned that relx of filament is seen
- image next to filament is endothelium
- More for pathology than CLs
Conical Beam
For inflammatory conditions
- Highest mag
- Smallest pinpoint of light
- Used to detect cells/flare in anterior chamber
- Illuminates anterior chamber
- About a 30° angle
Scleral Scatter
Indirect Illumination
- Detects central corneal clouding
- Pipe focused at limbus
- Light will scatter inside stroma
- Cornea is viewed against black pupil
Retro Illumination
Indirect Illumination
Viewing objects entirely with reflected light off of iris or red reflex from retina
Yellow Filter
- Good contrast
- Enhances objects on eye
Green Filter
- Enhances blood vessels on eye
- Used to see how deep a subconjunctival hemorrhage is
- Views neovascularization
- Blood vessels on iris
Cobalt Blue
Used with fluorescein dye (orange dye, green image)
-use widest (diffuse) illumination
-CL (RGP) and cornea evaluation (infections/irritations)
- Also used with IOP
