Tests for BSV Flashcards
(22 cards)
What is BSV?
Simultaneous use of both eyes to give a single mental impression in normal conditions of seeing
BSV is bifoveal and there is no manifest deviation.
What are the three components of BSV?
- Simultaneous perception
- Motor fusion
- Stereopsis
What does SPaMS stand for in the context of BSV?
Simultaneous perception, Motor fusion, Stereopsis
Name one important test for BSV.
- Cover Test
- Bagolini Glasses/Worth lights
- Prism Reflex Test/Prism Fusion Range
- 3D stereotests
What is the purpose of the Cover Test?
Qualitative test providing a good indication of the presence and level of binocular single vision expected.
How should Bagolini glasses be used in testing?
Sit patient at 6 meters or 33 cm, ask to fix a spotlight, place glasses in front, and ask number of lights and lines seen.
What are possible responses when using Bagolini glasses?
- Heteronymous diplopia
- Homonymous diplopia
- BSV
- Right suppression
- Left suppression
What is the primary use of Bagolini glasses?
- Diagnose presence of gross BSV
- Diagnose presence and type of diplopia
- Assess response to correcting prism
- Determine the suppressing eye
What is the method of testing with Worth Lights?
Sit patient at 6 meters, put on red & green goggles, ask how many lights are seen and their colors.
What responses can be recorded during the Worth Lights test?
- Heteronymous diplopia
- Homonymous diplopia
- BSV
- Left suppression
- Right suppression
What is the purpose of the Polaroid 4 Dot Test?
To test for bifoveal BSV using polarization as a means of dissociation.
What is the objective of the 4Δ prism test?
To assess the presence of bifoveal BSV, often used in microtropia assessment.
What are the normal fusion ranges for distance?
- 15Δ BO – 5-7Δ BI
What are the normal fusion ranges for near?
- 35Δ BO – 15Δ BI
What is the function of the Sbisa Bar?
To test the amount of dissociation required to disrupt BSV and promote diplopia.
What is the main function of the Synoptophore?
- Simultaneous perception
- Superimposition
- Sensory fusion
- Motor fusion
Fill in the blank: The Bagolini glasses test is used to diagnose the presence of _______.
gross BSV
True or False: Testing may take longer in abnormal cases.
True
What should be done if diplopia occurs during testing?
Check the response with a prism.
What is the purpose of assessing BSV in a patient with absent colour vision?
To determine how to adapt testing methods for accurate results.
What test is best suited to assess the gross BSV of a 4-year-old child?
Bagolini glasses test or Worth lights test.
List the tests in order: Cover test, Vision test, Case History, Bagolini glasses, Prism fusion range, stereotest.
- Case History
- Vision test
- Cover test
- Bagolini glasses
- Prism fusion range
- Stereotest
