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A - Z of Eyes & Focusing
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
G
Glare
A possible complication of refractive surgery in which the patient sees additional lustre around lights. Glare is a subjective experience that often decreases with time. Other causes of glare include cataract, corneal scars or other corneal problems.
Ghosting
A distortion of image due to irregular healing of the corneal surface.
Globe
The eyeball.
H
Halos
A complication of refractive surgery in which the patient sees additional rings around lights at night. Halos are subjective experiences that often decrease with time.
Haze
A relatively rare complication of LASIK caused by the deposition of ground substance in the cornea. An ophthalmologist can measure the haze response of a patient's eye under a slit lamp, but patients' experiences of haze vary. Outcomes for the patient include decreased night vision, halos or loss of best corrected visual acuity. Caused by the eye's reaction to the laser, haze often decreases with time and is more common with PRK.
Hyperopes
People who are farsighted.
Hyperopia
The ophthalmic term for farsightedness. In the hyperopic eye,images are focused behind the retina. The hyperopic eye is often described as being too flat or too short.
I
Intraocular pressure
The pressure the fluid contained within the eye exerts on the globe.
IOL Master 700
The latest version of this instrument. It is used to measure the power of the cornea, the length of the eye and the distance between the cornea and the lens of the eye. By accurately measuring all these, the implant needed in cataract or refractive lens surgery can be calculated. The implant corrects the focus of the eye, allowing good distance or near vision without glasses in most situations.
Irregular astigmatism
A refractive error caused by an irregular shape of the cornea in which the curve on one side of the meridian or axis is not symmetrical with the curve on the other side.
