Glossary

A - E    F - H     I - L     M - P    Q - T    U – Z

A

Astigmatism – The term used when the surface of the eye is oval rather than spherical. This can be corrected with the laser.

C

Conventional LVC – A term used to describe all types of laser vision correction whereby the calculations for how much corneal tissue to be removed is manually entered into a laser system by the surgeon.

Cornea – This is the clear curved window at the front of the eye. The eye is like a camera and the cornea acts as the light focusing system at the front of the eye and provides most of the eye’s focus.

D

Diopters – This is the optical measure of refractive power in glasses or contact lenses. It is measured as a positive, e.g. +3.50, if you are Hyperopic (long- sighted) and as a negative, e.g. -3.50, if you are Myopic (short-sighted). The larger the number the greater the refractive error.

E

Enhancement – A LVC procedure that may be undertaken to improve the visual outcome after LVC. Enhancements are usually done once the initial procedure has stabilised.

Epithelium – The outer most layer of the cornea. In PRK the epithelium is removed, usually with the laser in the T-PRK method so the laser can then treat the underlying corneal tissue. The epithelium then regenerates within about 4 days to its pre-procedure state. 

Excimer Laser – Is a high energy, cold laser that is used to reshape corneal tissue in LVC by emitting a pulsating beam of ultraviolet light that removes corneal tissue to a precise depth. Our excimer laser uses dual small laser beams each 0.65mm wide, ensuring precise removal of tissue.  


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