Goldmann applanation tonometry after myopic photorefractive keratectomy

To determine the accuracy of applanation tonometry in patients with corneas thinned by photorefractive keratectomy, and to correlate corneal changes with tonometric readings. The intraocular pressure was measured with Goldmann applanation tonometry in 87 patients who underwent photorefractive kerate...

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Bibliographic Details
Published in:Acta ophthalmologica Scandinavica 1998-10, Vol.76 (5), p.550-554
Main Authors: Rosa, Nicola, Cennamo, Giovanni, Breve, Maria Angelica, Rana, Agostino La
Format: Article
Language:English
Subjects:
Adolescent
Adult
Cornea - physiopathology
Cornea - surgery
Female
Follow-Up Studies
Humans
Intraocular Pressure - physiology
Lasers, Excimer
Male
Middle Aged
Myopia - physiopathology
Myopia - surgery
Photorefractive Keratectomy
Postoperative Period
Refraction, Ocular
Retrospective Studies
Tonometry, Ocular
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Summary:To determine the accuracy of applanation tonometry in patients with corneas thinned by photorefractive keratectomy, and to correlate corneal changes with tonometric readings. The intraocular pressure was measured with Goldmann applanation tonometry in 87 patients who underwent photorefractive keratectomy before and 1, 6 and 12 months after treatment. The treatments ranged from -1.5 to -14 diopters (mean=-7.6+/-4.1 diopters) and the fellow eyes were used as controls. In the treated eyes the intraocular pressure before surgery ranged from 11 to 26 mmHg (mean=17.7+/-2.8 mmHg). One month after surgery it ranged from 5 to 22 mmHg (mean=11.9+/-2.7 mmHg) with a significant underestimation (P=1x10(-33)). Six months after surgery it ranged from 6 to 22 mmHg (mean=12+/-3 mmHg) with a significant underestimation (P=5x10(-30)). Twelve months after surgery it ranged from 8 to 22 mmHg (mean=12.7+/-2.7 mmHg) with a significant underestimation (P=5x10(-31)). A correcting factor should be applied when using applanation tonometry to measure intraocular pressure in patients who have undergone PRK.
ISSN:1395-3907
1600-0420
DOI:10.1034/j.1600-0420.1998.760508.x