Glossary of terms associated with refractive laser surgery

Higher order aberrations that cause imaging errors of the eye other than near- and farsightedness or astigmatism. They are mainly due to slight irregularities on the corneal surface. In most eyes, these cause no disturbance during the day, but are only noticeable in twilight or at night. In bright daylight our pupil is small and the light enters the eye mainly along the optical axis. Higher order refractive errors have a smaller effect in this central channel. In twilight or darkness the pupil becomes larger. Then higher order errors lead to strong interferences because the light now also enters the eye through edge areas laying aside the optical axis. Therefore the visual acuity of an otherwise normal seeing patient may decrease as soon as light conditions become worse.

In this glossary we have compiled for you a list of terms associated with eye laser treatment, the so-called refractive surgery. You can find the desired explanation by clicking on the term.

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Aberration-free treatment

Aberrometer

Ablation

Accommodation

Aspheric

Barraquer, José I.

Contrast sensitivity

Cornea

Corneal epithelium

Corneal lamella

Corneal stroma

Corneal thickness

Corneal topography

Corneal wavefront

Customized Ablation

Cylinder

Decentration

Dioptres

Excimer laser

Eye laser

Eye Tracker

Femtosecond laser

Flap

Halos

Haze

Higher order visual defects

Keratoplasty

Limbus

Mikroceratome

Online pachymetry

Ocular wavefront

Overcorrection

Postoperative

Preoperative

Pupil

Refraction

Refractive power

Refractive Surgery

Retina

Re-treatment

Sclera

Sphere

Spherical aberration

Treatment zone

Undercorrection

Visual Acuity

Vitreous body

Wavefront technology