Quiz 1 (Slit lamp) Flashcards
How is the beam for a conical section (include illumination and mag)? Where should it be focused? What does it evaluate?
Circular or short square beam focused in the anterior chamber. High mag and illumination. It evaluates anterior chamber for cells or flare. The examiner needs to DARK ADAPT
What beam requires dark adaptation?
Conical section
What should the mag, width, height, illumination, and angle be for indirect retroillumination?
Any mag, 1-2 mm width, pupil height, max illumination, and 0 degrees (click stop)
Van Herick ratio: 1:1
Grade 4: wide open. Light reflection is narrow
What can optic section evaluate?
Cornea, anterior chamber (van herick technique), and lens
What filter can help analyze tear break-up time?
Cobalt blue
What should the mag, height, and illumination be for parallelepiped?
Low (10x) to moderate, full beam height, low to mod illumination
Van Herick ratio: 1: 1/2
Grade 3: open, unlikely to close
What should the mag, height, illumination, and angle be for Specular reflection?
High mag, max height, moderate illumination, and 45 degree angle
Where is the light directed for Sclerotic scatter?
Toward the limbus
How can you detect Guttatas?
Specular reflection can see this descemet invading the endothelium
What is the van herick technique?
Helps evaluate the anterior chamber angle, must be 60 degrees
What beam type isn’t used very much anymore because of PMMA CLs being obsolete?
Sclerotic Scatter. It was good for seeing haze
What filter is used for anterior segment photography?
Diffuser, it also is good for non-focal illumination
Van Herick ratio: 1: 1/4
Grade 2: narrow angle, shadow is thin compared to the reflection
