Intro To Slit Lamp Examination Flashcards
What is the microscope on the slit lamp?
Viewing system
What is the slip lamp portion function as?
Illumination system
What is the function of the stand?
Mount for microscope and slip lamp
What are the magnifications on the Zeiss model?
10X Ocular; 5X, 8X, 12X, 20X 32X
What are the magnifications on the Marco model?
16X Ocular; 6.3X, 10X, 16X, 25X, 40X
What are the magnifications on the Haag Streit model?
12.5X Ocular; 6.3X, 10X, 16X, 25X, 40X
Where the marker located on the Zeiss Slit lamp for magnification?
Side
Where the marker located on the Haag Streit Slit lamp for magnification?
Top
What formation can the eye pieces have?
Convergent
Parallel
What are the variables that can be adjusted when using the slit lamp?
Intensity
Height
Width
Color/filters
Angle of orientation
What are the 6 filters included in the slit lamp and their function?
Transparent (brightest)
Heat absorbing (increases patient comfort)
Neutral density (allows 28% transmission)
Red-free (green, impedes red wavelength light)
Cobalt blue (tonometry)
UV
What is in-click?
When the illumination system and the viewing system are focused on the same point in space
What is out-of-click?
When the illumination system and the viewing system are not focused on the same point in space
What is the purpose of diffuse illumination?
Examine lids, lashes, and conjunctiva
What is the bean angle used for diffuse illumination?
Oblique (45-60)
Dynamic
What is the beam height, width, magnification and illumination for diffuse illumination?
Maximum height
4mm to maximum width
Low magnification
Low illumination
What are the steps of diffuse illumination?
Ask patient to close eyes
Scan upper lid margin
Ask patient to open eyes, examine lower lid margin
Ask patient to look left, right, up (examine lower palpebral conjunctiva) and down (examine superior cornea) and examine bulbar conjunctiva
What is the purpose of the parallelepiped?
Examine cornea, iris, and lens
What beam angle, width and height are used for parallelepiped?
Oblique (45-60)
Maximum height
1-2mm width
What magnification and illumination are used for parallelepiped?
Low magnification
Low illumination
What are the steps for parallelepiped?
Start on temporal part of cornea
Scan across cornea (it is convex so move slit lamp in a small curve)
From nasal to temporal scan in a flat plane across iris
What is the purpose of the optic section?
Examine the cornea and lens to estimate the anterior chamber angle
What is the beam angle, height, and width used in optic section?
Oblique (45-60)
Max height
Minimum width
What is the magnification and illumination used for optic section?
Moderate high magnification
Moderate high illumination
What is the difference between direct and indirect illumination?
Change perspective of where you are looking at the structure of focus
