corneal vertex

corneal vertex

[TA]
the central part of the cornea, slightly thinner than the peripheral part.
Synonym(s): vertex corneae [TA], vertex of cornea
References in periodicals archive ?
TA, CA, and IA were expressed in negative correcting cylinder form and were described at the corneal vertex surface.
Hyperopic treatments are more prone to quality of vision issues if the laser treatment is decentred at all so for high hyperopic treatments targeting the laser on the corneal vertex rather than on the pupil may be preferable.
Ablations were centered on the corneal vertex using half the pupillary offset, that is, the distance between the pupil center and the normal corneal vertex measured by videokeratoscopy.
The company's is simple to use and makes it possible to demonstrate the features of comparative lens products, together with a clear representation of the differences that individual parameters (pupil distance, corneal vertex distance, pantoscopic tilt and face form angle) have on visual fields.
Preoperatively the corneal vertex was marked with a methylene blue-tinted Sinskey hook.
The pachymetry map was centered on the corneal vertex and displayed on the instrument monitor.
First, anterior corneal astigmatism was centered on the corneal vertex and not on the pupil center.
A front elevation map (in a one-map view) at 6 months after surgery was taken as confirmation of decentration from the corneal vertex. The (0,0) point was shown as the corneal vertex and a black cross at the pupil center in the topographic graph.
Caption: Figure 1: (a) Scatterplot showing the distribution of treatment centers (black dots) in relation to the corneal vertex in total eyes, right eyes, and left eyes of SMILE and SBK surgeries.