Dr William Boothe Surgeon

There are several types of glaucoma, the most frequent one being Open-Angle Glaucoma, which has no obvious symptoms at first. About 15% of glaucoma cases are Closed-Angle Glaucoma, and there are noticeable symptoms, such as nausea, eye pain, blurred vision, and headaches. There’s also Normal-Tension Glaucoma, where the intraocular pressure doesn’t build up, and no cause has yet been established for this yet, although there are theories.

Dr Boothe

Accommodation - The eye’s ability to switch focus from near objects to far objects. It’s done by tiny muscles attached to the eye’s lens, which pull on the lens to change its convexity. As we age, those muscles become weaker and the lens becomes stiffer, a condition known as presbyopia, where reading glasses become necessary to see close-up objects.

Acuity - (a-KEW-uh-tee) Clarity or sharpness of vision, commonly expressed as 20/20 vision in relation to the Snellen acuity chart. This is the eye chart seen at every eye doctor’s office, with the big E at the top.

Dr William Boothe

: limbus -
The visible borderline between the clear window (cornea) and the white globe (sclera) of the eye. The conjungtival layer which covers the globe also joins at the limbus. (see illustration x)

masks - Masks are used in PRK surgery to modify the removal of surface tissue by the laser. PRK surgery involves the removal of or fashioning of concave (myopic) or convex (hyperopic) lenses on the corneal surface. Most refractive errors also include some element of astigmatic irregularity. Most excimer laser machines employ different kinds of masks to customize, refine and smooth the corneal surface. Many machines have an internal constricting diaphragm (like a camera f-stop mechanism) as an internal mask for use in treating Myopia. One manufacturer uses an extra material applied unto the cornea (an ablatable or destroyable mask) for treating astigmatism. Another manufacturer uses a different shaped metal mask for treatment of hyperopia or myopia. Variable rotation of the masks is used to deal with astigmatism
Dr William Boothe Surgeon