LASIK SURGERY GLOSSARY OF TERMS
Accommodation – Correcting the vision of an eye with a crutch such as eyeglasses or contact lenses.
Anisometropia – Each eye having a different prescription or condition, such as hyperopia in one eye and myopia in the other.
Astigmatism – An irregularly shaped eyeball. Vision is blurred due to light rays entering the eye through the pupil not coming to one focal point on the retina. This is caused by the cornea not being uniform in cylindrical shape and the light rays are not running parallel in travel to the retina. Some of the light rays fall short and stop before reaching the retina while others hypothetically continue past the retina falling behind it.
Cornea: Located at the front of the eye; light passes through and focuses in the eye.
Corneal: The eye’s clear window to the world; it allows light to pass through and come to focus in the eye on its retina.
Epithelium: The clear outer covering of the eyeball.
Excimer laser: A laser machine that emits light rays (very concentrated) in the UV (ultraviolet) region of the spectrum.
Farsightedness: A.K.A. hyperopia; the ability to see objects at a distance more clearly than when objects are close up.
Hyperopia: A.K.A. farsightedness; the ability to see objects at a distance more clearly than when objects are close up.
In situ: Very precise and confined to a site of origin and does not invade neighboring tissue.
Intraocular: Inside the eyeball. The intraocular pressure is the amount of pressure within the eyeball.
Intraocular lens: An artificial lens implanted inside the eyeball of a cataract patient during surgery; it is made of acrylic, silicone, plastic, or other material.
Keratectomy: Part of the cornea is removed. This is done by laser or surgical excision. Examples of laser procedures are LASIK and PRK (photorefractive keratectomy).
Keratoconus: A cone-shaped cornea; the apex of the cone is forward.
Keratotomy: An incision is surgically made into the cornea.
Laser: A powerful beam of light (ray), when focused at an object at close range, produces intense heat. One of the uses for a laser is eye surgery such as PRK, LASEK, or LASIK.
Laser surgery: Surgery used to reshape the eyeball. Examples are: PRK, LASEK, and LASIK. The emitted beams of high-heat light rays reshape the eyeball making it more cylindrical resulting in better vision.
LASIK: An abbreviation for Laser-Assisted In Situ Keratomileusis; laser eye surgery that changes the cornea’s shape. This reduces or eliminates the need for corrective eye-wear such as contact lenses or eyeglasses.
Lens: The transparent structure (crystalline lens) inside the eyeball; it focuses light rays on the retina.
Myopia: Nearsightedness, the ability to see objects close up more clearly than objects at a distance.
Nearsightedness: myopia, the ability to see objects close up more clearly than objects at a distance.
Ophthalmology: The science and art of practicing eye medicine.
Presbyopia: The eye’s lost ability (due to age) to change focus of near objects and see them clearly. The muscles in the eye have grown weak with age and need help accommodating visual acuity.
Radial Keratotomy: Eye surgery procedure that flattens the cornea. This reduces its optical power and therefore corrects the condition myopia (a.k.a. nearsightedness).