12 Questions
How can the width of the streak of light produced by a streak retinoscope be adjusted?
By moving the sleeve up or down
What type of light does a streak retinoscope produce?
Line
What is the default position for using a streak retinoscope?
'Down'
How is the size of the spot of light adjusted in a spot retinoscope?
By moving the sleeve up or down
Which type of retinoscope does not require rotating the light source to examine different axis directions?
Spot retinoscope
How are 'with' movements neutralized when examining with a retinoscope?
- Plus lenses
What type of light does a spot retinoscope produce?
A spot of light
How can the width of the spot of light in a spot retinoscope be adjusted?
By moving the slide knob up or down
What is the main use case for a streak retinoscope?
To produce a line or streak of light
How can the spot light of a spot retinoscope be changed from convergent to divergent?
By moving the sleeve up or down
Which type of retinoscope requires rotating the sleeve to adjust the light?
Streak retinoscope
What is the purpose of using plus and minus trial lenses when examining with a retinoscope?
To neutralize red reflex
Study Notes
Adjusting Light in Retinoscopes
- The width of the streak of light produced by a streak retinoscope can be adjusted by rotating the sleeve.
- A streak retinoscope produces a linear streak of light.
Positioning and Examining with Retinoscopes
- The default position for using a streak retinoscope is to hold it at a 45-degree angle to the patient's eye.
- A spot retinoscope does not require rotating the light source to examine different axis directions.
Adjusting Spot Light in Spot Retinoscopes
- The size of the spot of light in a spot retinoscope can be adjusted by changing the aperture.
- The width of the spot of light in a spot retinoscope can be adjusted by changing the aperture.
Examining with Retinoscopes
- 'With' movements can be neutralized when examining with a retinoscope by moving the retinoscope in the same direction as the reflex.
- A spot retinoscope produces a circular spot of light.
Use Cases and Adjustments
- The main use case for a streak retinoscope is to examine astigmatism.
- The spot light of a spot retinoscope can be changed from convergent to divergent by rotating the sleeve.
- A spot retinoscope requires rotating the sleeve to adjust the light.
Trial Lenses
- The purpose of using plus and minus trial lenses when examining with a retinoscope is to determine the correct lens power.
Learn about the two main types of retinoscopes: streak retinoscopes and spot retinoscopes. Understand how the light source in each type can be adjusted for different examination purposes.
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