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    Test Your Eye

Test Your Eye

Near Vision Test

The near vision test is measuring your ability to read and see objects close up. This test is important if you have hyperopia or presbyopia.

Download the Acrobat file and print it out, using your printer's highest print quality setting.

Hold the chart about 35 cm (14") away and notice how far down the chart you can read. If you have perfect near vision you can read the bottom line from arm length and all the way into approx 15 cm from your eyes.

Making your own Near Vision Test chart use the following font sizes. Chose Arial or Currier fonts. You can also experiment with different colour background to train you ability to read text printed on any background.

Astigmatism Test

Astigmatism Test

If you have astigmatism then the axis will show up as distortion in one or several of the rays of the Astigmatic Mirror above. The angle of the major distortion is indicated on the chart.

People with natural clear vision see all the lines in the same thickness and exactly the same spacing between the lines.

Look at the Astigmatism chart from several distances and notice where the distortion begin and ends. It is possible to have astigmatism only at the near, or only at the distance, or at any plane in between.

Download the Acrobat file and print a chart in with the background colour you like the best. Set your printer to the highest print quality as possible.

The Astigmatic Mirror provide an accurate feedback concerning your astigmatism.

Colour perception

Colour perception

Colour perception is usually testes using the Isihara Test charts. These charts are designed to test for the typical red-green deficiency. People with red-green colour perception deficiency perceive some colours as gray and therefore label them differently than people with normal co lour perception.

The Isihara Test is a circle of multicoloured dots in which there is imbedded a number. In some cases people with normal colour perception see one number while people with colour perception deficiency see another number. If 10 or more of the plates are read correctly the colour perception is considered to be normal. If 7 or less of the plates are read correctly then the colour vision is considered to be deficient.

People with normal colour perception will read 29 while people with red-green colour perception deficiency will read 70. The numbers are made up of colours which are confused by people with red-green colour deficiency.

This Isihara plate is designed to identify people with Protanopia (long wave red deficiency) and Deuteranopia (middel wave green deficiency). People with mild red-green deficiency will see 96, but people with Protanopia will see only 6. People with Deuteranopia will see 9 only.

The Vision Training approach attempts to encourage finer hue distinctions which in turn develop better colour perception. Training is only effective for the common red-green colour perception deficiency.

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