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Optometric Procedures > 4 - Biomicroscopy (Exam 1) > Flashcards

4 - Biomicroscopy (Exam 1) Flashcards

1
Q

What 3 relationships do the microscope system and illumination system share in slit lamp optics?

A
  1. Parfocal
  2. Copivotal
  3. Isocentric
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2
Q

What is meant by parfocal?

A

Systems are focused to the same plane

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3
Q

What is meant by copivotal?

A

Systems pivot around the same point

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4
Q

What is meant by isocentric?

A

Systems are optically centered on the same point

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5
Q

How are the Haag-Streit and Zeiss styles of slit lamps different?

A

HS- Tower style, lamp/filter/aperture controls at top
only width/inclination controls at the bottom
Z - All controls at the bottom

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6
Q

What are the 7 slit lamp illumination variables?

A
  1. Width
  2. Height
  3. Angular orientation
  4. Inclination
  5. Filters
  6. Isocentricity
  7. Voltage
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7
Q

How thick is a Grade 1 anterior chamber angle relative to corneal thickness?

A

less than 1/4 thickness

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8
Q

How thick is a Grade 2 anterior chamber angle relative to corneal thickness?

A

1/4 thickness

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9
Q

How thick is a Grade 3 anterior chamber angle relative to corneal thickness?

A

1/4 to 1/2 thickness

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10
Q

How thick is a Grade 4 anterior chamber angle relative to corneal thickness?

A

Equal to or greater than

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11
Q

What grade of anterior chamber angles are likely to close with pupillary dilation?

A

Grade 1 and Grade 2

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12
Q

What grade of anterior chamber angles are unlikely to close with pupillary dilation?

A

Grade 3 and Grade 4

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13
Q

What are 4 important things for viewing the anterior chamber?

A
  1. Dim room illumination
  2. High magnification (25x)
  3. Parallelepiped width, height of pupil or smaller
  4. Focused in the the anterior chamber (behind cornea, in front of iris)
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14
Q

What type of illumination is used to examine optical surfaces of the eye?

A

Direct, specular reflection

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15
Q

What are 4 examples of structures that are best viewed with specular reflection?

A
  1. Tear film
  2. Corneal endothelium
  3. Anterior lens capsule
  4. Posterior lens capsule
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16
Q

When does specular reflection occur?

A

When the angle of incident light is equal to the reflection angle of returning light

17
Q

What is a term that describes the appearance of the corneal endothelium?

A

Golden mosaic

18
Q

What will significant loss of iris pigment result in?

A

Iris transillumination defects

Optometric Procedures (6 decks)

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