Visual Acuity Testing Procedures

This video tutorial by Dr. David Keegan explains how to check visual acuity using a Snellen chart. It covers the importance of accurate measurement, the process of using the chart, scoring methods, and handling errors. Additionally, it discusses testing visual acuity in children using symbol-based charts.

Why is it important to check visual acuity in a controlled way?

• To make the patient feel comfortable

• To save time during the examination

• To avoid using any equipment

• To ensure the results are reliable for future reference

What is the correct distance a patient should stand from the Snellen chart?

• 25 feet

• 10 feet

• 15 feet

• 20 feet

What should be used to cover one eye during the visual acuity test?

• A hand

• A paddle or piece of paper

• A pair of sunglasses

• A cloth

What does a visual acuity score of 20/200 indicate?

• The person can see at 200 feet what a person with normal vision can see at 20 feet

• The person can see at 20 feet what a person with normal vision can see at 200 feet

• The person has slight vision impairment

• The person has perfect vision

If a person makes two errors on the 20/70 line, what is their score?

• 20/40

• 20/50

• 20/70 - 2

• 20/70

What is the maximum number of errors allowed on a line before moving to the line above?

• One

• Two

• Four

• Three

What type of chart is used for children who cannot read letters?

• Snellen chart

• Kindergarten test chart

• Ishihara chart

• Amsler grid

What should you do if a child is uncooperative during the visual acuity test?

• Skip the test

• Try to create a comfortable environment for the child

• Assume they have poor vision

• Use a different chart

How should you score a child who can read all symbols on the 20/50 line but makes one error on the 20/40 line?

• 20/40 - 1

• 20/50

• 20/30 - 1

• 20/40

What is the main purpose of repeating the vision test for both eyes?

• To ensure the patient is not cheating

• To check for consistency

• For driving purposes and comparing vision in both eyes

• To make the test more challenging