Refractive Outcome and Corneal Topographic Studies after Photorefractive Keratectomy with Different-sized Ablation Zones

Rosa, Nicola; Cennamo, Giovanni; Pasquariello, Antonio; Maffulli, Francesco; Sebastiani, Adolfo

doi:10.1016/s0161-6420(96)30556-3

Cited by 33 publications

(8 citation statements)

References 24 publications

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“…The corneal thickness was measured before treatments, to exclude patients with corneal thickness less than 500 microns, but was not measured after treatment. As described in previous papers, we found a good correlation between attempted correction and changes in the corneal thickness (Cennamo et al 1994) and in corneal refractive power (Rosa et al 1996). The patients included in the study with IOP higher than 20 mmHg before treatment presented no clinical or visual field signs of glaucoma, but only a thicker cornea.…”

Section: Methodssupporting

confidence: 78%

Goldmann applanation tonometry after myopic photorefractive keratectomy

Rosa

Cennamo

Breve

et al. 1998

Acta Ophthalmologica Scandinavica

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ABSTRACT.Purpose: To determine the accuracy of applanation tonometry in patients with corneas thinned by photorefractive keratectomy, and to correlate corneal changes with tonometric readings. Methods: 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 ª1.5 to ª14 diopters (meanΩª7.6∫4.1 diopters) and the fellow eyes were used as controls. Results: In the treated eyes the intraocular pressure before surgery ranged from 11 to 26 mmHg (meanΩ17.7∫2.8 mmHg). One month after surgery it ranged from 5 to 22 mmHg (meanΩ11.9∫2.7 mmHg) with a significant underestimation (PΩ1¿10 ª33 ). Six months after surgery it ranged from 6 to 22 mmHg (meanΩ12∫3 mmHg) with a significant underestimation (PΩ5¿10 ª30 ). Twelve months after surgery it ranged from 8 to 22 mmHg (meanΩ12.7∫2.7 mmHg) with a significant underestimation (PΩ5¿10 ª31 ). Conclusions: A correcting factor should be applied when using applanation tonometry to measure intraocular pressure in patients who have undergone PRK.

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Section: Methodssupporting

confidence: 78%

Goldmann applanation tonometry after myopic photorefractive keratectomy

Rosa

Cennamo

Breve

et al. 1998

Acta Ophthalmologica Scandinavica

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“…After corneal refractive surgery, the corneal power is overestimated, and this error increases with an increase in treatment. 8,29,30 Nevertheless, if the results are confirmed in practice, our formula could improve refractive outcomes in many cases. AL Z axial length; AL Â K Z product of keratometry readings and axial length; Difference in K Z difference between preoperative and postoperative mean keratometry readings; K Z keratometry; Pt Z patient; SE Z spherical equivalent…”

Section: Discussionmentioning

confidence: 82%

New factor to improve reliability of the clinical history method for intraocular lens power calculation after refractive surgery

Rosa¹,

Bernardo²,

Borrelli³

et al. 2010

Journal of Cataract and Refractive Surgery

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“…After PRK, a refractive index of 1.3375 underestimates corneal power with keratometry and corneal topography analysis by 20% to 25%. [25][26][27][28][29] According to our results, anterior corneal optical density significantly changed during the 12 months after refractive surgery. A mean reduction in the anterior corneal refractive index by 0.02 was present 12 months after PRK.…”

Section: Discussionmentioning

confidence: 97%