Page 74 - The UK Guide to Laser Eye Surgery
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 74 Glossary
Optician
An expert in making and fitting glasses. An optician may also be qualified to dispense and/or fit contact lenses.
Optometrist
An optometrist is a non-medical eye health provider, who specializes in the examination, diagnosis, treatment, management and prevention of diseases and disorders of the visual system. In the UK, optometrists complete a three year degree at University. Many optometrists dispense glasses and contact lenses. Optometrists may not prescribe medicine, as they are not medical doctors.
Over-correction
An outcome of refractive surgery in which the resulting amount of correction is more than desired. Over-correction occurs most frequently when healing does not occur as predicted. It can usually be treated easily, with an enhancement procedure.
Pachymeter
A device that measures the thickness of the cornea.
Peripheral vision
The ability to see objects and movement outside the direct line of vision.
Photorefractive Keratectomy (PRK)
A surgical procedure using an excimer laser to reshape the central cornea, to give a flattened shape for people who are myopic or a more curved surface for people who are hyperopic.
Plano
No refractive error. Normal vision without the need for glasses or contact lenses.
Presbyopia
Part of the normal process of ageing. As we become older, the crystalline lens begins to lose its ability to zoom from distance to near vision. To compensate for this, people wear reading glasses such as bifocals.
Pupil
The small black circular space in the centre of the iris. The pupil changes its diameter in response to different light levels, becoming bigger in the dark and smaller in bright light. The pupil controls the amount of light reaching the retina and the depth of focus of the eye.
Pupillometry
A diagnostic test to measure the size of your pupils.
Refraction
A test to determine the best glasses or contact lenses to correct a refractive
error (myopia, hyperopia, presbyopia or astigmatism). ‘Refraction’ also refers to the bending of light by the use of a lens or other material.
Refractive error
A measurement of visual imperfection. The degree to which images received by the eyes are not focused on the retina (causing myopia, hyperopia, presbyopia or astigmatism), measured in dioptres.
Refractive lens exchange
See ‘Clear lens exchange’.
Refractive surgery
Any surgical procedure that alters the focusing power of the eye (including, but not limited to, the laser eye surgery procedures covered by this Guide).
ReLEx SMILE
Often known simply as SMILE (small incision lenticule extraction). SMILE is an evolution of LASIK laser eye surgery, in which a tiny amount of corneal tissue is removed through a ‘keyhole’ incision – no flap is created.
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