Laser in situ keratomileusis for myopia up to -11 diopters with up to -5 diopters of astigmatism with the summit autonomous LADARVision excimer laser system.

Abstract

OBJECTIVE:

To assess the safety and effectiveness of the Summit Autonomous LADARVision active tracking narrow beam excimer laser system for laser in situ keratomileusis (LASIK) correction of myopia and astigmatism.

DESIGN:

A multicenter, prospective noncomparative case series.

PARTICIPANTS:

This cohort consisted of 177 eyes corrected for spherical myopia up to -11 diopters (D) and 170 eyes corrected for myopia up to -11 D spherical equivalent with astigmatism up to -5 D.

INTERVENTION:

Treatments were performed at four sites in the United States using a 6-mm optic zone for spherical myopes and a 5.5-mm optic zone with a 1-mm blend for astigmats.

MAIN OUTCOME MEASURES:

Visual acuity, subjective refraction, vector analysis, subject satisfaction, intraocular pressure, complications, and adverse reactions.

RESULTS:

Six-month follow-up was available on 157 spherical eyes and 113 astigmatic eyes. For spherical myopes, uncorrected visual acuity (UCVA) was 20/20 or better in 60.5%, 20/25 or better in 80.3%, and 20/40 or better in 93.9%. The mean spherical equivalent was -0.29 +/- 0.45 D with 75.2% +/- 0.50 D and 94.9% +/- 1.00 D of intended. A loss of two lines of best spectacle-corrected visual acuity (BSCVA) occurred in 0.6%, and no eyes lost greater than two lines of BSCVA. For astigmatic myopes, UCVA was 20/20 or better in 52.0%, 20/25 or better in 74.5%, and 20/40 or better in 94.1%. The mean spherical equivalent was -0.23 +/- 0.49 D with 75.2% +/- 0.50 D and 95.6% +/- 1.00 D of intended. A loss of two lines of BSCVA occurred in 0.9%, and no eyes lost greater than two lines of BSCVA. Vector analysis showed that 99% of the intended cylinder was corrected on average with a mean angle of error of 4.2 degrees. Refractive stability was achieved between 1 and 3 months in 97.5% of spherical eyes and 99.4% of astigmatic eyes and confirmed between 3 and 6 months in 100% of both spherical and astigmatic eyes.

CONCLUSIONS:

Eyes treated for myopia up to -11 D of spherical equivalent with or without astigmatism up to -5 D show early refractive stability, good UCVA outcomes, no significant loss of BSCVA, accurate correction of astigmatism, and slight undercorrection without a change from the photorefractive keratectomy algorithm and with a single treatment.

• Authors: M B McDonald, J D Carr, J M Frantz, A M Kozarsky, E Maguen, A B Nesburn, Y S Rabinowitz, J J Salz, R D Stulting, K P Thompson, G O Waring 3rd
• Journal: Ophthalmology (Ophthalmology) Vol. 108 Issue 2 Pg. 309-16 (Feb 2001) ISSN: 0161-6420 [Print] United States
• PMID: 11158804 (Publication Type: Clinical Trial, Journal Article, Multicenter Study, Research Support, Non-U.S. Gov't)

Topics

• Adult
• Aged
• Astigmatism (surgery)
• Cohort Studies
• Cornea (surgery)
• Female
• Follow-Up Studies
• Humans
• Intraocular Pressure
• Keratomileusis, Laser In Situ (adverse effects, methods)
• Male
• Middle Aged
• Myopia (surgery)
• Patient Satisfaction
• Postoperative Complications
• Prospective Studies
• Refraction, Ocular
• Safety
• Treatment Outcome
• Visual Acuity