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A - Z of Eyes & Focusing
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
D
Decentration
A complication caused by movement of the pupil that can be corrected with an enhancement procedure.
Descemet's membrane
The layer of the cornea between the stroma and endothelium. Five microns thick (0.005 millimeters), this membrane provides an adhesion layer for the endothelium.
Deturgescence
The balance of hydration in the eye.
Dioptres (Diopters - American)
A measurement of refractive error. Hyperopia is measured in terms of positive dioptres. Myopia is measured in terms of negative dioptres. The most common refractive errors ranged between +6 to -6 dioptres.
Dry eye
A Syndrome characterized by corneal dryness due to deficient tear production.
E
Ectasia
A progressive corneal thinning and bulging.
Emmetropes
People who have no refractive error.
Emmetropia
The ophthalmic term for a perfect refractive state - no nearsightedness, farsightedness or astigmatism.
Endothelium
The innermost layer of the cornea. The endothelium is one cell layer thick (5-10 microns or 0.005-0.01 millimeters) and provides hydration balance to maintain the cornea's transparency. The endothelium serves three main purposes it regulates the stroma's water content, provides a barrier to ingress of several constituents of the aqueous humor, and actively transports glucose.
Enhancement
A secondary refractive procedure performed after the initial one in an attempt to achieve better visual acuity.
Epithelial ingrowth
A complication of LASIK wherein epithelial cells grow underneath the corneal flap.
Epithelium
The outermost layer of cells of the cornea. Six cells thick (20 microns), the epithelium is the eye's first defense against infection.
Excimer laser
A "cold" laser used in refractive surgery to remove corneal tissue.
F
Farsightedness
See "Hyperopia"
Femto-LASIK
Another term for Z-LASIK. The use of the Ziemer LDV femtosecond laser (precise thickness corneal flap creation) with the AMO VISX excimer laser (precise reshaping of the cornea to reduce your focusing error) - also known as blade-free LASIK.
Femtosecond laser
A silent, bladeless, computer-guided laser used in Step One of LASIK to safely create corneal flaps of exact size, shape, and depth. Ziemer engineering have produced the Leonardo Di Vinci (LDV) femtosecond laser for the current application of making the flap in laser vision correction. Faster speed and lower energy produce results that are significantly better than the Intralase system and other systems that use "amplification" for speed. The "oscillation" method unique to the LDV allows for speeds in the mega hertz range and complete smooth dissection at appropriate and very low energy. This translates into better vision for the patient.
