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EYE TEST

An eye test takes around 30 minutes and could add years to your sight.

The process of an eye test is very simple. Visioncare recommends that you have an eye test at least every 2 years, or more frequently if recommended by your optometrist.

Pre-Test Check

Before your eye examination, we need to complete a questionnaire about your general and eye related health. This helps us to recommend spectacles and lenses to suit your needs. A reading of your current prescription may be taken from your old glasses.

You will also be asked to look into a machine that measures how well your eyes focus and gives your approximate prescription.

Internal eye pressure

A machine blows a puff of air into your eyes to measure their internal pressure. This is one of several important tests that can indicate the early stages of glaucoma.

Consulting room

The optometrist will ask about you and your family’s medical history. Several eye conditions are hereditary and many others are related to health, so it is important to take these factors into account.

Subjective tests

These are tests where you say what you see. You look through an instrument at various images projected onto the opposite wall while your optometrist flips different lenses in front of your eyes. These tests determine the best prescription to give you balanced vision.

Near and far

As you get older the lens in your eye becomes less flexible, making it difficult to focus close up, so your optometrist may test your ability to focus at varying distances. In one such test the optometrist asks you to focus on a sliding target while it is moved towards you until it becomes blurred.

Color, lights and movement

To check that your eyes move and focus properly, your optometrist will move a pen around in front of your eyes and towards your nose.

Health of the eye – inside

Your optometrist shines a bright light into your eye and examines the health of the back of the eye and checks the clarity of the lens. During this part of the examination, any early indications of high blood pressure, diabetes, glaucoma or cataract can be picked up.

Health of the eye – outside

A slit lamp – a powerful, illuminated microscope – is used to check the outside of your eye for abnormalities and certain conditions of the cornea.

Field screening

Your optometrist may want to test for glaucoma by testing for loss of vision at the side, in the middle or in patches. This is done using a visual field screener, which flashes dark lines against a bright background and you press a button when you see them. If you fail to see some lines, you may have a blind spot

Retinal camera

With every eye test, a picture from the inside of your eye will be taken for further examination and documentation. Like this it is possible to compare the state of your condition once we examine you again.

Heidelberg Retina Tomograph

The Heidelberg Retina Tomograph (HRT) is a system that combines a laser-scanning camera and specialized software that evaluates the optic nerve and the macula.

It is a proven, essential tool for detecting and managing glaucoma (=high tension in the eye, can cause blindness) and edema.

For the first time this revolutionary technology allows us to understand the progression of optic nerve involvement in regard to glaucoma and other eye conditions long before irreversible vision loss takes place.

Results

After you have completed all the tests, your optometrist will give you your prescription and explain his/her recommendations.

SPH (sphere) – the amount of long (+) or short (-) sight.
CYL (cylinder) – the amount of astigmatism, or visual distortion, caused by an irregularly shaped cornea.
AXIS – the direction of the astigmatism, measured in degrees.
PRISM – correction needed to balance the eyes.
ADD – the amount of additional correction needed to focus at close distances. If you have a measurement shown in this section it means that you have different prescription requirements for distance and reading. This can be solved by having different spectacles, or bifocal or multifocal lenses.


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