Quiz on Low Vision
Rehabilitation
Monthly Quiz - May
Learning point: Importance of proactive counselling in low vision
rehabilitation
Q1. A young adult diagnosed with early-stage Retinitis Pigmentosa. What should be the proactive counselling in this case?
Answer: Educating and preparing the patient for progressive vision loss
Distractors:
• Explain surgical treatment options
• Introducing magnifiers and spectacles
• Scheduling a follow-up visit when vision drops to 6/60
Answer feedback: For patients with progressive conditions like RP, ARMD, it is important to prepare them to use
assistive tools before severe impairment sets in.
Learning point: Why should spectacles be used with stand magnifiers in some cases? (Presbyopes, aphakic, pseudoaphakic)
Q2. A patient of age 44 has been using a stand magnifier for several years. Recently he is struggling with clarity unless using
the bifocal spectacles. Why is this necessary?
Answer: Diverging rays need near addition
Distractors:
• Stand magnifiers are high-powered
• The magnifier is too heavy
• Image is formed at infinity
Answer feedback: The light rays emerging from the magnifier are diverging. As a result, the eye requires accommodation or a
near addition lens (like the one in bifocal spectacles) to focus these rays clearly on the retina. Without the near addition,
especially in presbyopic patients who have reduced accommodation, the image will appear blurry. This is why bifocals are
necessary with a stand magnifier for clear vision.
Learning point: Importance of low vision rehabilitation in Homonymous Hemianopia
Q3. A person of age 63 with 6/6 vision , using near vision glasses has homonymous hemianopia. Why does this patient need
low vision care?
Answer: Field loss affects daily function
Distractors:
• Poor depth perception
• They are elderly
• Glasses are outdated
Answer feedback: Even with normal acuity, visual field loss like hemianopia severely impacts function. This significantly
affects mobility, reading, and daily activities, as individuals may bump into objects or miss important visual cues. Low vision
care helps by providing visual aids, training in scanning techniques, and environmental modifications to improve safety and
independence.
Learning point: Types of magnification
Q4. Match the correct type of magnification
1. Relative size magnification
2. Relative distance magnification 3. Angular magnification
4. Projection magnification
A.
B.
D.
C.
Answer: 1-D, 2-C, 3-B, 4-A
Distractors:
• 1-C, 2-A, 3-D, 4-B
• 1-A, 2-C, 3-B, 4-D
• 1-B, 2-D, 3-C, 4-A
Answer Feedback:
Relative Size - Making the object physically larger
Relative Distance - Moving the object closer to the eye
Angular - Using optical devices to enlarge image
Projection - Projecting an enlarged image electronically
Learning point: Identifying Typoscope
Q5. Which one of the following is a typoscope?
Answer:
Distractors
:
Answer feedback: A typoscope is a low vision aid. It is usually a black card or plastic sheet with cut-out windows or slots that
help a person focus on small sections of text at a time.
Learning point: Dioptre value of magnification
Q6. A 70-year-old patient with low vision requires 3X magnification to comfortably read N8 printed text at a near working
distance. You decide to prescribe a hand magnifier. How many Dioptres should the hand magnifier have to provide the
required 3X magnification?
Answer: +12D
Distractors:
• +3D
• +9D
• +24D
Answer feedback: Magnification (M) = D / 4, where D is the dioptric power.
To achieve 3X magnification: D = 3 × 4 = +12 D.
Learning point: Assessing contrast sensitivity in Low vision rehabilitation using Pelli Robson test
Q7. What is the normal / lowest level of contrast that can be recorded in Pelli Robson chart?
Answer: 2.25 log units
Distractors:
• 1.00 log units
• 2.00 log units
• 3.00 log units
Answer feedback: Measuring a level of contrast is important in low vision assessment. It shows the ability of a patient in the
lower illumination settings and helps to counsel the patients about contrast enhancing methods such as placing dark coloured
objects in a light coloured background.
Normal contrast sensitivity
Mild to moderate loss
Significant contrast loss
Severe contrast loss
- 2.0 and above
- 1.5 – 2.0
- 1.0 – 1.5
- Below 1.0
Learning point: limitation of using telescopes in low vision rehabilitation
Q8. Which of the following is a key limitation of using telescopes in low vision rehabilitation?
Answer: Narrow field of view and need for training
Distractors:
• Cannot be mounted on glasses
• Only works indoors
• Causes permanent eye damage
Answer feedback: Telescopes provide magnification but reduce the field of view, and users need training for localization,
focusing, spotting, tracing, tracking and scanning.
Learning point: importance of environmental modification
Q9. In a low vision rehabilitation session, marking steps with bright colored tape is advised. This is an example of
Answer: Environmental modification
Distractors:
• Orientation and mobility training
• Optical rehabilitation
• Sensory integration
Answer feedback: Low vision often affects contrast sensitivity and depth perception. Bright colored tape (usually yellow or
white) increases contrast. It improves safety and orientation.
Learning point: Rehabilitation plan in permanent macular degeneration
Q10. Mr. Kumar has permanent macular degeneration. What is the main goal of his low vision rehabilitation
plan?
Answer: Maximizing the use of his remaining vision
Distractors:
• Correction with glasses
• Optic nerve surgery
• Surgical restoration of vision
Answer feedback:
Low vision rehabilitation focuses on helping individuals with irreversible vision loss optimize their remaining functional vision.
In conditions like macular degeneration, the goal is not to restore lost vision but to enhance daily functioning through aids,
training, and adaptive strategies. Glasses or surgery cannot reverse the damage caused by macular degeneration.