Applanation intraocular pressure (IOP) decreases only slightly after a reduction in central corneal thickness (CCT) with myopic photorefrac tive keratektom (PRK)

K. F. Damji, R. Vlunger

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1 Citation (Scopus)


Purpose. Increase in IOP has heen positivd; correlated with increasing CCT in normal eyes Eyes undergoing f'Rk offer a unique nppi riumi to study the effecl of decreasing CCT on IOP. Methods. A desiripme sludv ofpaiiaiHs undergoing elcimer laser mopic PRK was performed. Eles were excluded fiom PF K if lhe> had glaucoma, corneal, or intraocular pathology IOP u a; measured In GoHmann applanation, and CCT by an ultrasonic pachymeter centered on the pupil We elan ined correlalion between IOP and CCT pre and postop as well as indidu;il poslop changes n IOP vs changes in CCT Results. Results are staled as mean ± SU Pieup liiere u ere 4 eles. 50 7% female and 49 3% male, mean age 38 4 ± 104 Diopters The mean preop IOP was 14 43 ± 2.99 mm l Ig and CCT 544 ± d (m A significant correlation between IOP and CCT was seen both preop (0 41 ~ u 1 7 n,in Hg drop m IOP per 50m decrease in CCT, p=0.015) and at 6 months postop (0 :S2o + o 1'J mm Hg per 50m, p=0 007). There was a significant correbtion beiueen drop in IOP and change in CCT at both 6 (N=220) and 12 (N=167) months (p=u 015, n uii9) '1 he mum change in IOP was -1 04 ± 3 50 at 6 months, and -I 31 ± 3 8d mm Hg at 12 moiilhs CCT changes were -60 7 ± 39 7/m and -56.2 ± 39 Om. respeclixeK No signilicant correl mon was noted between CCT and age, or preop refracthe error Coiiflusioii. Paiienls u idergomg myopic PRK at our institution have a significant decrease in IOP and CCT pos op However. the magnitude of this IOP drop appears small enough .Hal clinical correcii in does not seem warranted in most cases.

Original languageEnglish
Pages (from-to)S249
JournalInvestigative Ophthalmology and Visual Science
Issue number4
Publication statusPublished - 1997
Externally publishedYes

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