Centre for Sight offers complimentary screening to determine your suitability for surgery. Some of the tests we carry out are listed below. Once suitability has been confirmed, you will be offered a full consultation if you decide you wish to proceed with laser vision correction.
In order to determine your suitability for surgery, we carry out a thorough ophthalmic evaluation which includes a large number of tests. We follow a linear model of assessment, which means you will move from one specialist testing area to the next. This may mean having to wait a short while between tests but it is worthwhile in order to obtain accurate results. The technician responsible for each test will explain the procedure to you.
| Vision testing: |
testing your eyesight with and without glasses, and high and low contrast with glasses |
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| Lensometry: |
glasses are checked to see what you are wearing |
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| Autorefraction and Keratometry: |
an automated test of your eye refraction and measure of your corneal curvature |
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| Pupillometry: |
pupil size evaluation and dynamic changes in dark & light conditions |
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| Refraction: |
test for glasses to determine the level of correction required |
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| Corneal Tomography: |
measures the cornea in three dimensions |
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Orbscan IIz system (Bausch & Lomb) |
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Pentacam (Oculus) - more accurate measure of central corneal power and thickness |
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| Wavefront evaluation: |
measures refractive power and fine aberrations using Zywave (Bausch & Lomb) |
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| Iris Recognition & Registration: |
also performed with the Zywave |
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| Pachometry: |
measures corneal thickness using an ultrasound device |
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| Tonometry: |
measures intraocular pressure (the fluid pressure inside the eye) |
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| Intraocular pressures: |
to ensure you do not have Glaucoma |
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| Cyclopegic Refraction: |
measures refractive error with the eye muscles in a paralysed state |
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| Pupil Dilation: |
enables the consultant to evaluate the lens and retina |
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| Others that may be deemed necessary: |
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Visante (Zeiss) Ocular
Coherence Tomography |
accurately images the cornea and anterior chamber of the eye in 3 dimensions and is non-contact (i.e. non-invasive) |
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| Specular Microscopy: |
evaluates and measures the cell count on the back of the cornea |
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| Visual Fields test: |
checks peripheral and central vision to ensure there is no loss e.g. from Glaucoma |
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| IOLMaster (Zeiss): |
checks length of the eye and precisely calculates implant power that may be required for cataract surgery if appropriate |
The options for Vision correction will be discussed with you by an eye surgeon. If unsuitable for laser vision correction your consultant will may suggest alternative options...