Podcast
Questions and Answers
Which of the following are types of visual field defects?
Which of the following are types of visual field defects?
What are the strategies used for testing visual fields?
What are the strategies used for testing visual fields?
What is the name of the manual perimeter?
What is the name of the manual perimeter?
Goldmann perimeter
Automated perimetry is similar to Humphrey perimeter, but has fewer spots that are assessed. What does this stand for?
Automated perimetry is similar to Humphrey perimeter, but has fewer spots that are assessed. What does this stand for?
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During automated perimetry, the patient fixates on a central dot, and the dots that shimmer/vibrate are clicked.
During automated perimetry, the patient fixates on a central dot, and the dots that shimmer/vibrate are clicked.
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What are the different lighting techniques used in Anterior Segment evaluation?
What are the different lighting techniques used in Anterior Segment evaluation?
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What does TBUT stand for?
What does TBUT stand for?
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What is the normal value for TBUT?
What is the normal value for TBUT?
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What factors influence the tear film break up time?
What factors influence the tear film break up time?
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What is the name of the test used to measure the tear production?
What is the name of the test used to measure the tear production?
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What are the common phrases used when performing a Schirmer's test?
What are the common phrases used when performing a Schirmer's test?
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The normal range for the Schirmer's test is > 10 mm in 5 min with anesthetic.
The normal range for the Schirmer's test is > 10 mm in 5 min with anesthetic.
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What is the difference between basal tear production and reflex tear production?
What is the difference between basal tear production and reflex tear production?
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Exopthalmometry measures the protrusion of the eye from the orbit (graptopsosis)
Exopthalmometry measures the protrusion of the eye from the orbit (graptopsosis)
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What are some conditions that can cause exopthalmos?
What are some conditions that can cause exopthalmos?
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The normal range for exophthalmometry is 12-20 mm OU
The normal range for exophthalmometry is 12-20 mm OU
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What factors influence exophthalmometry measurements?
What factors influence exophthalmometry measurements?
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Slit lamp bio-microscopy views anterior structures of the eye.
Slit lamp bio-microscopy views anterior structures of the eye.
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What anterior eye structures are examined with the slit lamp?
What anterior eye structures are examined with the slit lamp?
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What is the name of the lens used for examining posterior structures in the eye?
What is the name of the lens used for examining posterior structures in the eye?
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What is the process used for examining anterior segment using a handheld lens?
What is the process used for examining anterior segment using a handheld lens?
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What are the two tests done in conjunction with the optical assistant?
What are the two tests done in conjunction with the optical assistant?
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What is the term used when blood vessels elongate from the iris to the bulbar conjunctiva?
What is the term used when blood vessels elongate from the iris to the bulbar conjunctiva?
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Tear film analysis measures the amount of tears in the eye.
Tear film analysis measures the amount of tears in the eye.
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Study Notes
Visual Field Testing
- Three main types of visual field defects: pre-chiasmal, chiasmal, post-chiasmal
- Testing strategies can be kinetic or static
- Testing methods include confrontation, tangent screen, manual, and automated perimeters
Exophthalmometry
- Measures eye protrusion from the orbit (proptosis)
- Factors affecting measurement: thyroid issues, trauma, orbital tumors
Slit Lamp Bio-Microscopy
- Examines anterior eye structures (lids, lashes, conjunctiva, cornea, tear film, anterior chamber, iris, crystalline lens)
- Can also view posterior structures with a handheld lens
- Anterior segment evaluation uses various lighting methods (diffuse, direct, indirect, retro, parallelopiped)
- Identifies neovascularization (new blood vessels in the eye)
Automated Perimetry
- Humphrey Visual Field: measures peripheral vision, uses a range of sphere and cylinder lens that decrease sight because the object or text is closer than what you normally see
- Tests include patching one eye, artificial tears, flashes, light on one side of the visual field
- Frequency Doubling Technology (FDT) assesses more areas than Humphrey, patient fixates on a center dot, and boxes of lines that shimmer vibrate appear.
Manual Perimetry (Goldmann Perimeter)
- Assesses what colors the patient sees when looking at a dome (color flashes)
Schirmer's Tear Test
- Measures tear production, helpful for dry eye
- Normal range is >15mm (no anesthetic, reflex tears) and > 10mm (with anesthetic, basal reading)
- Tear production is measured by the amount of tears that are absorbed on a strip placed over the lower eyelid
Tear Film Analysis
- Evaluates tear film integrity using fluorescein and dyestuffs
- Measures the time it takes for the tear film to break down until a dry spot appears
- Normal contact lens fitting values are >10 seconds
- Factors evaluated during fitting include position, coverage, centration, movement, and alignment
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Description
Explore the various methods of visual field testing and eye examination techniques. This quiz covers visual field defects, exophthalmometry, slit lamp bio-microscopy, and automated perimetry. Test your knowledge on the different testing strategies and their applications in ophthalmology.
