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 Why have an eye exam? How do 20/20 eye exams work? • Electronic Pre-test • Optomap Retinal Scan • The Sight Test and Eye Health Check • Pressure Test • Visual Field Test  An Eye Exam allows the optometrist to: • Determine any relevant prescription for your eyes (long or short-sighted, astigmatic, presbyopic) • Check that the muscles of the eyes work together • Check your Eye Health and screen for any associated general health problems • Perform any further testing as deemed necessary like Eye Pressures, Visual Fields, Colour Vision or Pupil Dilation |
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 Electronic pre-test Before you are seen by one of our 20/20 optometrists, you will experience an electronic pre-test. This involves you looking into an instrument showing a target in the distance. This target, which is generally a balloon, goes in and out of focus. What we are doing is measuring the curvatures of your cornea (front part of the eye), the distance between your eyes and the best estimate of your prescription. This saves our optometrists a lot of time, which means they have more time to spend on checking other things like your eye health. Furthermore, should you wish to try contact lenses assuming your eyes are healthy, this is instantly possible, as your corneal curvatures have already been measured. This data is captured onto a 'smart' card and given to the optometrist who then has immediate access to it through the computerised sight-test equipment in their consulting room. |
 
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Optomap Retinal Scan At 20/20 the Optomap Retinal Scan forms part of our standard eye exam such that everyone experiences the benefits of a thorough health check of the back of their eyes. To take your Optomap you will be asked to look into the scanning instrument at a spot of green surrounded by a circle of red. When the full red circle is seen the Optomap photo is taken in under a second. This photo allows us to view much more of the retina compared to conventional methods and extends the area seen to about 200 degrees. Your 20/20 optometrist will evaluate the picture in addition to performing a conventional eye health check and inform you if anything is the matter. You may rest assured that your eye health has been comprehensively assessed! |
   
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The Sight Test and Eye Health Check This is the bit where you meet your 20/20 optometrist. After a friendly 'Hello'and 'My name is', you should find yourself in the chair of the consulting room with your optometrist asking questions to establish reasons for your visit and what symptoms you may be experiencing with your eyes. An inquiry into your general health, medications taken, family health and eye history is quite normal and essential as many factors can affect your eyes. Your prescription will then be determined after the data from the 'smart' card has been entered into the computerised testing unit also known as a phoropter. You will find yourself looking at a succession of test charts through various lenses placed into the unit. Your optometrist will ask questions about the charts, which will determine whether you are long-sighted, short-sighted, astigmatic, presbyopic, or a combination of these. The equipment also enables us to check your eye muscles, so tests which tell us if the two eyes are working together can be done. Furthermore, your close-up vision will be assessed to ensure that no prescription is required when you are on the computer or reading a book. Using an ophthalmoscope and perhaps a microscope, your eye health can then be assessed all the way from back to front. Extra tests like Depth Perception, Colour Vision, Visual Fields and Eye Pressures may be required and your optometrist will inform you if this is necessary. The most common extra tests are eye pressures and visual fields. At the end of the consultation your optometrist will discuss your sight and eye health with you as well as all the options available if treatment is required. Please feel free to ask your 20/20 optometrist anything, as it is our aim that you leave feeling reassured and happy. |
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Pressure Test At 20/20 use is made of a non-contact Tonometer which measures eye pressure. It works by allowing a gentle puff of air on to the front of your eye, which changes the shape very briefly. At a certain level of shape change the instrument is calibrated to represent a certain level of pressure. By means of a system of lights it measures how long it takes for your eye to change to the calibrated shape. This time taken is proportional to your eye pressure. It then does a maths trick and out pops your eye pressure reading in a matter of seconds! As it is a non-contact instrument it is completely sterile and no risk of infection exists at all. |
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Visual Field Test Visual field tests often seem more complicated than they are. At 20/20 our visual field tests are actually lots of fun and can be likened quite simply to a harmless game of space invaders. The only difference is that you have to keep your eye in one place the whole time. Each time you think you see a spot of light, as with the aliens in space invaders, you hit a button and it lets us know. The purpose of field-testing is to check your peripheral vision, which may be affected in some cases. The most eye common condition causing field loss is Chronic Glaucoma. Sometimes more serious conditions like pituitary tumours may be caught by having a field test. In this case, the field test could be a lifesaver.  |
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