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What’s involved in a Sight Test

You can rest assured that although having an eye test is a straightforward process, all our examinations are very thorough. Lasting approximately forty minutes, our highly trained optician will look closely at all aspects of your vision and eye health.eye test

We’ll ask some questions about your sight, your general health, your family’s health and your lifestyle. There are lots of different tests that can be carried out during your eye examination, so your Space Healthcare clinical team will tailor this to suit your individual needs. While testing your eyes, we’ll look at the following:

  • Vision quality
  • Unaided and aided vision (with any glasses or contact lenses you already use)
  • Eye muscle performance and health
  • Internal eye health
  • Front of eye health, including eye fluid pressure
  • Further tests for depth perception, colour vision and your visual field may also be performed if required

All of our tests are carried out using the ultimate in eye examination technology and your Space Healthcare clinical team will provide step-by-step explanations so you know exactly what is involved at each stage.

The following guide provides a brief overview of what’s involved in some of the tests we may carry out:


The tonometer measures the pressure inside your eyes, known as the intraocular pressure.  We know (from personal experience) that in most eye tests this is the worst part of the entire process!  A puff of air is usually directed into your eye. It may be completely harmless, but it always makes you jump, even when you know it’s going to happen! The air bounces back at the instrument, giving a measurement of the pressure inside each eye.

It’s an important test, as high pressure can indicate the early stages of glaucoma, a sight-threatening condition. Caught early, this can easily be corrected and treated.

How we do this test:

At Space Healthcare, we’ve replaced the dreaded ‘air-puff’ with a state-of-the-art machine called I-Care®. Not only does this avoid the need for puffs of air, it takes more accurate readings as well. A much more comfortable experience, and a true win-win situation!


An autorefractor is often used to examine how the eye processes light. This test only takes a few seconds and is completely painless. Resting your chin on a chin rest, you to look at a picture. The autorefractor then calculates an estimate of your required prescription. This information is then used by your optician along with other tests to determine the prescription that gives you the best standard of vision.

How we do the test:

At Space Healthcare, our eye examinations are carried out on the same highly sophisticated Zywave ®  analysis scanner that we use if you are considering laser vision correction. This is certainly the most accurate visual analysis you will have ever had, and produces a much more detailed prescription than most eye tests can hope to achieve. It even recognises the unique pattern of your iris, so that it’s impossible to confuse you with someone else!

The Test Chart:

The test chart is probably the most familiar piece of equipment you will have experienced during an eye test.  The most common chart is the Snellen chart, which is a series of letters of differing sizes – ranging from the largest at the top to the smallest at the bottom. The results for one eye often vary from the other, so each eye will be tested individually before both eyes are finally tested together. The optometrist flips different lenses in front of your eyes that change how clearly you can see. Depending on your answers, they change the lenses until you have the clearest, most comfortable vision possible.

How we do the test:

At Space Healthcare, we’ve invested in state-of-the-art technology, so that instead of an illuminated or projected test chart we use a computer-generated image on a ultra-high definition LCD screen. This allows us to produce an almost infinite variety of sophisticated visual tests to accurately gauge your vision. More accurate tests mean higher quality vision solutions.

Fixation Disparity Test:

This determines if your eyes are working well together and how much correction may be needed to balance your eyesight.You will often be asked to look at a panel and say whether the bars appear to be in line both horizontally and vertically.

How we do the test:

At Space  Healthcare we use ultra-high definition LCD screens to display a variety of different visual tests. This allows us to measure any fixation disparity to a much greater level of accuracy that traditional fixed panel displays.

The Slit Lamp:

The slit lamp is a powerful, illuminated microscope that is used to examine the outer surface of your eyes – the cornea, the iris and the lens – to check for abnormalities or scratches. The slit lamp examination is particularly important for contact lens wearers.

How we do the test:

At Space Healthcare we have the very latest technology, allowing us to record everything that the optician sees during the slit lamp examination onto our specialist computer software. This means that we can easily check for any changes inside your eye. If we’re at all concerned, we can even send the digital  images for a second opinion from our ophthalmic surgeon: the very best care you can receive!

Visual Field Screener:

This is used to determine your field of vision and to locate any ‘blind spots’ within that field. A visual field screener randomly flashes dots of light on a black background. If you fail to see any of the dots, this can be an indication of a blind spot.

How we do the test:

At Space Healthcare we use the latest computer-controlled technology made by Ziess, one of the world’s the leading optical companies, to make sure our visual field screening is as accurate as possible.

Testing your Focus:

To find out if you need corrective lenses, your optician will test your ability to focus on both close-up objects. Many opticians check this by asking you to read text printed on a card or piece of paper.

How we do the test:

At Space Healthcare we have the latest technology to allow testing charts to be displayed on a hand-held screen. This gives us a much greater range of sophisticated testing solutions, which will enable us to best judge your reading prescription.

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