Primary Health Care (PHC) professionals in Aboriginal and Torres Strait Islander health services perform basic eye and vision checks as part of routine preventive health checks (Adult and Child Health Checks), according to their level of training. The PHC professional will refer patients with reduced vision, diabetes and other eye conditions either to an optometrist or an ophthalmologist for further assessment.
The National guide to a preventive health assessment for Aboriginal and Torres Strait Islander people recommends that eye and vision assessments are a necessary part in preventive health checks for Aboriginal and Torres Strait Islander adults . Refer to the attached step-by-step guide for an outline on the recommended referral and decision-making process for these eye and vision assessments.
Every eye and vision check in PHC should include:
This document outlines each of these steps. There are additional tests for children and adults with diabetes (refer to the end of the chapter on where to find more details).
Why? The symptoms a person has with their vision are just as important as the VA you measure, as the symptoms won't always be associated with reduced VA. Even if VA is 'normal', symptoms such as eye strain and difficulty focusing indicate the need for an optometry exam.
How? Asking a few questions about a person's eyes and vision before testing will give useful information to guide the rest of the assessments.
In questioning, use open-ended questions to cover the following points:
What is VA? Visual acuity (VA) is a measure of how clearly a person sees when they are looking directly at an object. Distance VA applies to objects at 6m and beyond. It is often measured at 3m, which is more practical.
Why? Distance VA is the main indicator of a person's visual function. Measuring VA over time is the main way reduced vision can be detected and then an appropriate referral for eye care initiated.
How? Measure the person's presenting distance VA, using a standard chart, for the right (R) and left (L) eye. You need to find the smallest line that a person can possibly see.
In all primary health checks we want to measure presenting distance VA. Presenting vision is the person's VA when they present for an eye check. This is called either:
Figure 1a: Distance letter chart
Figure 1b: Distance tumbling E chart
The distance VA chart (Figure 1a) should be placed at the appropriate distance and in good light. The person covers their eye not being tested with the palm of their hand (Figure 2). Then ask the person to read the smallest line on the chart that they can see.
Figure 2: Covering the eye with the palm of the hand - peeking is impossible.
If the person cannot read, use an E chart (Figure 1b). Ask the person to indicate the direction of the E's they can see on the chart. They can either tell you the direction (e.g. 'up', 'left' etc.) or point the direction using their hand (Figure 3). Encourage the person to give you an answer - 'Even if it feels like you are guessing'. This will often give a whole other line or two beyond where they wanted to stop reading.
Figure 3: Hands showing the direction of the 'E'
Once they have read the lowest letters they can read, record the distance VA, which can be found on the side of the chart. Include whether it is aided or unaided. Repeat for the left eye.
Example of recording VA:
Distance VA: Unaided R 6/12, L 6/7.5,
Why? Do this if distance VA is 6/9 or worse as it will help to find out if there is refractive error. This will tell you if spectacles will help correct a person's vision.
How? Measure the person's distance VA through a pinhole occluder.
Use a pinhole occluder (Figure 4). If your Health Centre doesn't have one, order a set for each consulting room from your medical equipment supplier. Some pinhole occluders only have one hole, others have multiple holes. Multiple holes is preferred.
Testing VA with the pinhole is done in the same way as distance VA testing, just using the pinhole occluder in front of the eye being tested. The other eye is occluded. The person looks through any of the pinholes and reads the smallest line that they can see.
Record the VA for each eye that was measured. To show it was measured with a PH write either next to the VA, PH VA, VA with PH, or simply VA with pinhole.
Example of recording pinhole VA:
Distance PH VA: R /7.5, L 6/7.5,
Figure 4: A pinhole occluder with multiple holes
Why? This is a very quick and easy test which adds strength to vision screening, by detecting people who need spectacles for close vision. Most people over the age of 40 will have some difficulties with near vision.
Figure 5: Near VA Chart
How? Measure the smallest print size a person can see with both eyes together at their usual near reading distance.
Use a near vision chart (Figure 5). Near vision charts have paragraphs of words of different size. The different sizes are called an 'N' point size. N5 is very small print and N8 about the size of normal newspaper print.
Measure presenting near vision. If the person has reading glasses they should wear them.
Ask the person to hold the near chart where it is comfortable for them to hold reading material and to read the smallest print they can see. Near VA is measured with both eyes together. For people who cannot read text, use near vision charts with numbers or E's. Record the smallest print read, and whether near vision was measured aided (with current reading glasses) or unaided (no reading glasses).
Why? To identify any external eye abnormalities that, where required, can be appropriately managed or referred.
How? Assess the outside structures of the eye using a light and some magnification if needed (e.g. pen torch, ophthalmoscope or head band loupe with illumination), and note any abnormalities.
Figure 6: Examining the front of the eye
Assess the outside structures of the eye for any abnormalities.
Examine the following structures of the eye, looking for any abnormalities:
In addition, for children, check there is a red reflex when you shine a light on the eye, and also check for strabismus. You don't need to diagnose something if you're unsure what it is, just record what you see and refer to the appropriate eye care professional.
|External eye signs||
* These may be emergencies. Contact your local ophthalmologist to discuss the case over the phone before deciding on the management or initiating a referral. Follow standard clinical protocol (e.g. CARPA standard treatment manual).
For more detailed information and interactive demonstrations and learning activities about conducting routine eye and vision assessments for Aboriginal and Torres Strait Islander people, check out the 'Primary Eye Care Checks' eLearning module available on the Remote Area Health Corps (RAHC) website: http://www.rahc.com.au/elearning
This module is freely accessible and CPD accredited.
(Refer to the downloadable PDF of Eye and vision assessment for the larger version of this step-by-step guideline).
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© 2013 Brien Holden Vision Institute
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