Dr William Boothe

PTK - Photo Therapeutic Keratectomy "Cold" laser removal of surface tissue of the cornea such as scar tissue for medical or optical treatment reasons.

ptygeria - A growth of scar tissue on the cornea. These lesions like pinguecula are caused by an ultraviolet burn to the surface layer or epithelium.

radial keratotomy - A surgical operation where 90% thickness cuts are made in the cornea. These cuts are made in a radial fashion and spare the visual center of the cornea. The intention is to flatten the central cornea.

Dr Boothe

CrystaLens - A type of intraocular lens which changes focus between close and distant objects. More information.

Crystalline lens - The eye’s natural lens, which is behind the iris and in a healthy eye is completely clear. Light passes through it and is refracted by the lens to focus on the retina. Tiny muscles attached to the lens change its convexity according to where the eye is focused. As we age, it can start to become cloudy (cataracts), impairing our vision.

Dr Boothe

: ophthalmologist - A medical doctor who specializes in the eye. To become an Ophthalmologist one must first obtain a Medical Degree (M.D. in North America) and then complete further specialty training. A medical degree typically takes 7 or 8 years university training and a specialist certification an extra 3 years in the USA or 4 years in Canada. Specialist MD's are usually divided into "medical" and "surgical" disciplines and Ophthalmology is technically a "surgical" discipline. Some Ophthalmologists chose not to perform surgery and can be called "medical ophthalmologists".
optician - An expert in the art and science of making and fitting glasses. (I'll have to find out the training time.)