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The visual acuity test determines the smallest letters at 6 meters a patient
can read on a standardised eye chart such as the Snellen chart. Patients with
6/6 vision are considered to be normal because they can read at 6 meters what
most people can read at 6 meters. Those who can only read upto the 6/60 line have poor vision because they can only read at 6 meters what most people can
read at 60 meters. Reading below the 6/6 line is considered to be better than
normal vision.
Steps:
- stand the patient at the appropriate distance from the chart
- patients with glasses should be allowed to wear them during the test
- provide an occluder to cover the eye not being tested
- ask the patient to read the smallest line they can see on the chart
- if a patient can read the 6/6 line but gets 2 letters wrong, it would be recorded as 6/6 (-2) visual acuity
- if more than 2 letters are wrong, then the visual acuity is the previous best line
- repeat these steps on the opposite eye
This information is for academic purposes only and opinions are likely to differ.
Please refer to you local guidelines for clinical best practises.
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(HRE)
