COT Low Vision and Optical Aids 3

Question 1

A bioptic telescope is prescribed primarily to assist with which visual task?

Accepted Answer

Brief 'spotting' tasks such as reading street signs and traffic signals

Answer

Sustained reading of small print at near distance

Answer

Viewing computer screens at intermediate distance

Answer

Examining the patient's fundus during an examination

Question 2

Which optical device can be mounted on spectacles to redirect images from a blind visual field area into the patient's seeing field?

Accepted Answer

Fresnel prism

Answer

High-plus reading lens

Answer

Reading stand magnifier

Answer

CCTV camera

Question 3

In a Galilean telescope, the eyepiece (ocular) lens is:

Accepted Answer

A concave (minus) lens

Answer

A convex (plus) lens

Answer

A prism pair

Answer

A plano (zero power) lens

Question 4

What is the primary practical advantage of a hand-held magnifier over spectacle-mounted high-plus lenses for certain low vision patients?

Accepted Answer

It allows the patient to vary the working distance and is convenient for brief or intermittent tasks

Answer

It provides significantly higher magnification than any spectacle lens

Answer

It completely eliminates optical aberrations

Answer

It always provides a wider field of view than spectacle magnifiers at equivalent power

Question 5

When prescribing progressively higher-plus reading additions for a low vision patient, the key optical trade-off is:

Accepted Answer

Greater image magnification but a progressively shorter working distance

Answer

Better color vision but significantly reduced visual acuity

Answer

Improved peripheral vision but worse central resolving acuity

Answer

Wider field of view but reduced image contrast

Question 6

Which of the following is an example of a non-optical low vision aid?

Accepted Answer

Large-print books and bold-line writing paper

Answer

Spectacle-mounted magnifier

Answer

Closed-circuit television (CCTV) magnifier

Answer

Hand-held refracting telescope

Question 7

What is the purpose of a typoscope in a low vision rehabilitation program?

Accepted Answer

To isolate a single line of text, reducing surrounding glare and improving contrast for reading

Answer

To measure intraocular pressure in low vision patients

Answer

To project a magnified image of text onto a monitor screen

Answer

To formally test a patient's contrast sensitivity function