Slit Lamp Examinations Flashcards by Lauren Yu

Diffuse Illumination

Illumination: Low
Illumination Angle: 30-45
Slit width: MAX
Slit Height: MAX
Magnification: 6.4x - 10x

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Optic section

Illumination: Medium to High
Illumination Angle: 45
Slit width: <2 mm
Slit Height: MAX
Magnification: 16- 25x

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Parallelpiped

Illumination: Low to Medium
Illumination Angle: 45
Slit width: 2-3mm
Slit Height: MAX
Magnification: 10 -25x

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Conical beam

Illumination: High
Illumination Angle: 40-60
Slit width: <2mm
Slit Height: <2mm
Magnification: 16 -25x

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Specular Reflection

Illumination: Low
Illumination Angle: 30 (30 Observation Arm)
Slit width: <2mm
Slit Height: MAX
Magnification: 16-40x

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Tangential

Illumination:High
Illumination Angle: 75-90
Slit width: 2-3mm / same as parallelpiped
Slit Height: MAX
Magnification: 6.4x

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Retro illumination from Iris

Illumination: Medium
Illumination Angle: 45
Slit width: <2mm
Slit Height: 4-5mm
Magnification: 16-40x

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Retro illumination from Iris

Illumination: Medium
Illumination Angle: 45
Slit width: <2mm
Slit Height: 4-5mm
Magnification: 16-40x

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Retroillumination from fundus

Illumination: Medium to High
Illumination Angle: 0-10
Slit width: <2mm
Slit Height: 4-5mm
Magnification: 10x

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Retroillumination from fundus

Illumination: Low to Medium
Illumination Angle: 0-10
Slit width: <2mm
Slit Height: 4-5mm
Magnification: 10x

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Sclerotic Scatter

Illumination: Medium - High
Illumination Angle: 45- 60
Slit width: <2mm
Slit Height: MAX
Magnification: 6.4x -10x

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Van Herick Technique

Illumination: Medium - High
Illumination Angle: 60
Slit width: <2mm
Slit Height: MAX
Magnification: 6.4- 10x

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What is the purpose of slit lamp biomicroscopy?

To diagnose eye conditions and evaluate the health of the anterior segment of the eye.

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What is the purpose of the slit lamp biomicroscopy?

To diagnose eye conditions and evaluate the health of the anterior segment of the eye.

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The slit lamp biomicroscope is consists of 3 systems. Name and their purpose

Illumination system - it sends the light into the patients eye.

Observation system - allows the observer to see the magnified structures.

Mechanical system - positioning and adjustment of patient and observer.

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What is the magnification range provided by most slit lamps?

6x to 40x

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What slit lamp biomicroscope has the light source located below the level of the slit?

Zeiss Slit lamp Biomicroscope

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What is the principle is used in the illumination system of both Zeiss and Haag streit slit lamps

Kohler illumination principle

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What is the purpose of the cobalt blue filter in slit lamp

Enhances the view of fluorescein dye in the tear film

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What is the purpose of the green filter (Red free filter)

Enhances the view of blood vessels and hemmorhage

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Normal endothelial shape

Hexagonal

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Slit width for optic section illumination

<2mm

Slit height for retroillumination

4-5mm

Magnification for tangential illumination

6.4x

Illumination angle for specular reflection

30 (30 Observation Arm)

Purpose of indirect illumination

Provides a dark background allowing corneal opacities to be viewed with more contrast.

Purpose of sclerotic scatter

To highlight pathology by absorbing and scattering light through the cornea.

Normal TBUT

10-15 seconds

Purpose of Van Herick Texhnique

To evaluate the anterior chamber without gonioscopy.

What do you call when there’s a formation of small new blood vessels?

Neovascularization

What Illumination technique gives a good overall picture of the eye, but no fine details. It is the general survey of the eye.

Diffuse illumination

What are the structures you are observing in the parallel piped illumination?

Cornea, Iris, Lens

What illumination technique will you use if you want to examine the anterior chamber for flares, inflammatory cells, or floating particles?

Conical Beam

Illumination angle for diffuse illumination?

30-45

Slit width for parallel piped

2-3mm

Magnification range for optic section illumination

16-25x

Condition is typically examined using the conical beam technique?

Anterior uveitis

Illumination for specular reflection

Low

Normal shape of endothelial cells

Hexagonal

What is polymegethism

Variation in size of endothelial cells

Where are guttata typically found

Central cornea

What is the common indication of aging in the cornea

Hassall- Henle bodies

What is the illumination angle for tangential illumination

75-90

Slit height for retro illumination from the iris

4-5mm

Difference between anterior uveitis and closed angle attack regarding keratic precipitates

Present in anterior uveitis, absent in closed angle attack

Slit width is used for retroillumination from the fundus

<2mm

What optical principle does sclerotic scatter utilize?

Total Internal Reflection

What is the appearance of leucoma

White

Illumination angle for Van Herick Technique

Magnification range of sclerotic scatter

6.4-10x

Primary use of the parallel piped technique

General examination

Illumination level of conical beam

High

Optic section technique help visualize

A section of a structure without cutting it