Офтальмохирургия (Dec 2015)
INFLUENCE OF TOPICAL ANAESTHETICS ON CORNEAL TOPOGRAPHY
Abstract
Introduction. By now it is a well-established fact that topical anaesthetics have an influence on IntraOcular pressure. The topical anaesthetic will give a lower intraocular pressure reading. As a follow-up to this, the aim of this study, is to find out if the topical anaesthetic will give a change in the mapping of the corneal topography. Material and methods. 26 eyes from 13 patients were mea-sured in the study. The topographer used was the BON topographer and tonometry was performed with Icare. The topical anaesthetic used was Alcaine by Alcon.The following measurements were taken on each eye:1. Corneal Topography immediately after blink, hereafter wet state c.t.2. Corneal topography after 15 seconds without blink, here-after dry state c.t.3. IOP without topical anaesthetic, called IOP1.4. An interval of 5 to 10 minutes in order for the cornea to “stabilize” after tonometry. This was done to ensure that corneal biodynamics is not playing a role for the sequential measurements.5. Topical anaesthetics administered, one drop in each eye and an interval of 1 minute was allowed before measurements were resumed.6. Corneal topography immediately after blink, hereafter wet state an. c.t.7. Corneal topography after 15 seconds without blink, here-after dry state an. c.t.8. IOP with topical anaesthetic, called IOP2.Results. The statement in the introduction was confirmed when measuring IOP without and with topical anaesthetic. The IOP is lowered with 2 to 4 mm Hg with an anaesthetic. The change of corneal topography comparing topographies with and without anaesthetic in both wet and dry state was very small and will not have an influence on surgical outcome in refractive surgery. Conclusion. Refractive surgery as well as cataract surgery final outcomes will not be affected when using a topical anaes-thetic. The change in corneal curvature is negligible.
