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eye-examination معاینات چشم

معاینات چشم

Periodic eye and vision examinations are an important part of preventive health care. Some important eye examinations are mentioned bellow:

Corneal and retinal topography
These are computerised tests used to create a ‘map’ of the curvature of the cornea or surface of the retina. This test is not necessary during a routine eye examination. The analysis will show distortions of the surface such as swelling or scarring, as well as conditions such as astigmatism. This corneal test may be used to evaluate patients before they undergo any refractive surgery, corneal transplants, as well as for fitting contact lenses. The retinal test may be used to follow patients with serious conditions of the retina.
Refraction test
This eye test determines your glasses prescription. The patient looks at a chart, usually six meters away, or in a mirror simulating six meters’ distance, and tries to read it while looking through a special instrument known as a phoropter. The eye care specialist moves lenses of different strengths into place for the patient to determine the clearer looks. This eye test will also identify presbyopia, hyperopia, myopia and astigmatism.
Slit-lamp examination
This test uses a microscope shining a beam of light shaped like a small slit on the eye. The specialist may also dilate your pupils while you are undergoing this eye examination. The eye test can be used to help diagnose cataracts, retinal detachment, macular degeneration, injuries to the cornea and presbyopia.
An eye test used to help diagnose glaucoma by measuring the pressure in the eye. The ‘air puff’ tonometer measures the eye pressure indirectly by the eye’s resistance to a puff of air.

Applanation instruments can also be used to measure pressure. They are the most accurate but require local anaesthetic.

An ultrasound eye examination uses sound waves to provide a picture of the eye’s internal structure. It is useful in evaluating ocular tumours as well as the retina when this is being obscured by cataracts or a haemorrhage. This eye examination will be performed as part of preoperative evaluation for cataract surgery.



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