COT Low Vision and Optical Aids 2

Question 1

A basic telescopic system used for distance low vision consists of which optical components?

Accepted Answer

An objective lens and an ocular (eyepiece) lens

Answer

A prism pair and a concave mirror

Answer

Two concave lenses aligned in series

Answer

A bifocal segment and a plano carrier

Question 2

What is the function of a 'reading cap' when added to a distance telescope?

Accepted Answer

To convert the telescope for near-vision tasks

Answer

To protect the objective lens from scratches

Answer

To reduce glare from bright sunlight

Answer

To widen the field of view at distance

Question 3

Which electronic magnification device offers adjustable magnification, contrast reversal, and color settings to assist with reading tasks?

Accepted Answer

Closed-circuit television (CCTV) / video magnifier

Answer

Hand-held optical magnifier

Answer

Fresnel prism spectacles

Answer

Bioptic telescope

Question 4

The preferred retinal locus (PRL) is best described as:

Accepted Answer

A peripheral retinal area spontaneously adopted for fixation when the fovea is damaged

Answer

The fovea in a healthy, unaffected eye

Answer

The optic nerve head (blind spot)

Answer

The region of highest rod photoreceptor density

Question 5

Which illumination strategy is most beneficial for low vision patients performing near tasks such as reading?

Accepted Answer

High-intensity, directed task lighting positioned near the work surface

Answer

Dim ambient lighting to minimize glare

Answer

General fluorescent overhead lighting only

Answer

Avoiding artificial light and relying on natural daylight only

Question 6

Why is contrast sensitivity testing important in a low vision evaluation, even when Snellen acuity appears only mildly reduced?

Accepted Answer

It assesses functional vision at various spatial frequencies and may reveal deficits not captured by standard letter acuity

Answer

It measures the patient's ability to detect bright flashing lights for night driving

Answer

It directly measures color discrimination ability

Answer

It quantifies the patient's peripheral motion detection

Question 7

Which absorptive lens tint is most commonly recommended to reduce photophobia and improve contrast for patients with age-related macular degeneration?

Accepted Answer

Yellow or amber-tinted lenses

Answer

Blue-tinted lenses

Answer

Clear anti-reflective coating only

Answer

Red-tinted lenses