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A device which cuts a flap of the cornea prior to removal some of the thickness of the underlying corneal stroma with the excimer laser during refractive surgery.

The accumulation of fluid within the central area of the retina. This may occur as a complication of intraocular surgery, as a response to uveitis or as a complication of other retinal conditions such as diabetic retinopathy.

The central portion of the retina that is responsible for central vision. An insult to the macula can cause loss of central vision and a significant decrease in visual acuity.