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the ability of an object, such as the eye, to bend light as light passes through it.

A medical state in which the eyes are misaligned.

Also known as lacrimal glands. Paired almond-shaped glands, single for each eye, which secrete the aqueous coat of the tear film.

Clear, colorless substance that fills the eyeball between the lens and the retina.

A medical condition that appears suddenly with no apparent explanation is considered idiopathic because of some unknown reason. 

Area of the tissue to be removed while surgery.

Anesthetizing drops that are placed on the eye previous to LASIK to help minimize any uneasiness during the procedure.

The process of quantifying and setting the laser to the needed energy for correct tissue removal. Some machines carve a PMMA plastic button to be measured by optical apparatuses, and others employ a 1 micron thick foil as a process of calibration.

A sluggishly increasing lump that forms due to obstruction and swelling of an oil gland in the eyelid.

A type of steroid hormones used to treat a range of inflammatory disorders. Chronic use may lead to creation of posterior subcapsular cataracts.