DSSSB Previous Year MCQs: Binocular Vision
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Q-1: The Double Maddox test is done to measure: (2019) (DSSSB Optometrist Previous MCQs)
a. Esodeviation
b. Exodeviation
c. Cyclodeviation
d. Exophoria
Answer: c. Cyclodeviation
The Double Maddox rod test involves placing a red Maddox rod over one eye and a white one over the other to create two distinct parallel line images. By having the patient rotate the lenses until the two lines appear perfectly parallel, the clinician can accurately detect and quantify torsional misalignment known as cyclodeviation.
The Double Maddox rod test involves placing a red Maddox rod over one eye and a white one over the other to create two distinct parallel line images. By having the patient rotate the lenses until the two lines appear perfectly parallel, the clinician can accurately detect and quantify torsional misalignment known as cyclodeviation.
Q-2: To neutralise a hypertropia, the prism should be positioned with: (2024) (DSSSB Optometrist Previous MCQs)
a. Apex directed inferiorly
b. Apex directed superiorly
c. Base directed superiorly
d. Base directed obliquely
Answer: b. Apex directed superiorly
Hypertropia is a vertical strabismus where the visual axis of the deviated eye points upward. To optically neutralize this deviation, a correcting prism must be placed with its base over the defect (base down), which fundamentally means the apex is directed superiorly.
Hypertropia is a vertical strabismus where the visual axis of the deviated eye points upward. To optically neutralize this deviation, a correcting prism must be placed with its base over the defect (base down), which fundamentally means the apex is directed superiorly.
Q-3: Which of the following is NOT true about stereopsis? (2019) (DSSSB Optometrist Previous MCQs)
a. It is measured in arc
b. TNO test is based on monocular clues
c. Frisby test is used after 4 years of age
d. Lang test is used in young children
Answer: b. TNO test is based on monocular clues
The TNO test utilizes random-dot stereograms viewed through red-green anaglyph glasses to accurately assess binocular depth perception. Its specific design completely eliminates all monocular spatial clues, forcing the visual cortex to rely purely on bifoveal disparity to identify the hidden shapes.
The TNO test utilizes random-dot stereograms viewed through red-green anaglyph glasses to accurately assess binocular depth perception. Its specific design completely eliminates all monocular spatial clues, forcing the visual cortex to rely purely on bifoveal disparity to identify the hidden shapes.
Q-4: What is the preferred management strategy for accommodative esotropia with a high AC/A ratio? (2024) (DSSSB Optometrist Previous MCQs)
a. Progressive glasses
b. Trifocal glasses
c. Single vision glasses
d. Polaroid glasses
Answer: a. Progressive glasses
Accommodative esotropia with a high AC/A ratio results in a significantly larger inward deviation at near than at distance. Progressive addition lenses or executive bifocals are the gold standard optical management, as they relax the excessive near accommodation and simultaneously eliminate the over-convergence.
Accommodative esotropia with a high AC/A ratio results in a significantly larger inward deviation at near than at distance. Progressive addition lenses or executive bifocals are the gold standard optical management, as they relax the excessive near accommodation and simultaneously eliminate the over-convergence.
Q-5: In case of esodeviation during PBCT, the base is placed: (2019) (DSSSB Optometrist Previous MCQs)
a. Base up
b. Base down
c. Base in
d. Base out
Answer: d. Base out
The Prism Bar Cover Test (PBCT) objectively measures the exact magnitude of a strabismic deviation. To neutralize an esodeviation, the clinician must place the optical prism with its thickest portion facing outward (base out) to manually shift the image onto the displaced fovea.
The Prism Bar Cover Test (PBCT) objectively measures the exact magnitude of a strabismic deviation. To neutralize an esodeviation, the clinician must place the optical prism with its thickest portion facing outward (base out) to manually shift the image onto the displaced fovea.
Want to test your knowledge further?
Our complete course features hundreds of in-depth MCQs covering critical optometry topics such as:
- Hess charting interpretation and Hering’s law of equal innervation
- Definitive clinical methods for diagnosing manifest strabismus (heterotropia)
- Differentiating heterophoria testing methods (Maddox rod vs. cover test)
- Pathophysiology of non-paralytic accommodative esotropia
- Clinical implications of a positive angle kappa (pseudo-exotropia)
- Associations and structural characteristics of intermittent exotropia
- Understanding proximal convergence and psychological depth cues
- Diagnostic importance of the prolonged patch test in breaking fusion
- Proper optical neutralization of vertical and horizontal strabismus
- Advanced management of high AC/A ratio accommodative esotropia
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