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Article

Comparison of 6.0 mm versus 6.5 mm Optical Zone on Visual Outcomes after LASIK

by
Majid Moshirfar
1,2,3,*,
Rachel Huynh
4,
Nour Bundogji
5,
Alyson N. Tukan
5,
Thomas M. Sant
4,
Shannon E. McCabe
1,6,
William B. West, Jr.
4,
Kirk Drennan
1,
Yasmyne C. Ronquillo
1 and
Phillip C. Hoopes
1
1
Hoopes Vision Research Center, Hoopes Vision, Draper, UT 84020, USA
2
John A. Moran Eye Center, Department of Ophthalmology and Visual Sciences, University of Utah, Salt Lake City, UT 84132, USA
3
Utah Lions Eye Bank, Murray, UT 84107, USA
4
University of Utah School of Medicine, Salt Lake City, UT 84132, USA
5
University of Arizona College of Medicine Phoenix, Phoenix, AZ 85004, USA
6
Mission Hills Eye Center, Pleasant Hill, CA 94523, USA
*
Author to whom correspondence should be addressed.
J. Clin. Med. 2021, 10(17), 3776; https://doi.org/10.3390/jcm10173776
Submission received: 13 July 2021 / Revised: 13 August 2021 / Accepted: 20 August 2021 / Published: 24 August 2021
(This article belongs to the Special Issue Refractive Surgery: Current Practice and Future Trends)
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Abstract

Previous studies have demonstrated safety and efficacy using 6.0 and 6.5 mm optical zones in the WaveLight EX500 Excimer Laser System but have not evaluated if differing optical zone sizes influence refractive outcomes. This study examines visual outcomes between two study populations undergoing LASIK with either a 6.0 mm (1332 patients) or 6.5 mm (1332 patients) optical zone. Outcomes were further stratified by severity of myopia (low, moderate, and high) and astigmatism (low and high). Patients were matched by age and preoperative manifest sphere and cylinder. Postoperative measurements were then compared. The 6.5 mm group demonstrated better postoperative manifest refractive spherical equivalent (MRSE), manifest sphere, and absolute value of the difference in actual and target spherical equivalent refraction (|∆ SEQ|), within the total population, moderate myopia, and low astigmatism groups, but this did not lead to improved postoperative uncorrected distance visual acuity (UDVA) or best corrected distance visual acuity (CDVA). Though astigmatic correction and postoperative angle of error were similar between optical zone sizes, they were significantly worse with high myopia. Overall, this study demonstrates differences in visual outcomes between the 6.0 and 6.5 mm optical zone sizes that may warrant consideration; however, essentially, the results are comparable between them.
Keywords: optical zone size; 6.0 mm; 6.5 mm; LASIK; Allegretto; refractive outcomes; myopia; astigmatism; dry eye syndrome; SPK optical zone size; 6.0 mm; 6.5 mm; LASIK; Allegretto; refractive outcomes; myopia; astigmatism; dry eye syndrome; SPK

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MDPI and ACS Style

Moshirfar, M.; Huynh, R.; Bundogji, N.; Tukan, A.N.; Sant, T.M.; McCabe, S.E.; West, W.B., Jr.; Drennan, K.; Ronquillo, Y.C.; Hoopes, P.C. Comparison of 6.0 mm versus 6.5 mm Optical Zone on Visual Outcomes after LASIK. J. Clin. Med. 2021, 10, 3776. https://doi.org/10.3390/jcm10173776

AMA Style

Moshirfar M, Huynh R, Bundogji N, Tukan AN, Sant TM, McCabe SE, West WB Jr., Drennan K, Ronquillo YC, Hoopes PC. Comparison of 6.0 mm versus 6.5 mm Optical Zone on Visual Outcomes after LASIK. Journal of Clinical Medicine. 2021; 10(17):3776. https://doi.org/10.3390/jcm10173776

Chicago/Turabian Style

Moshirfar, Majid, Rachel Huynh, Nour Bundogji, Alyson N. Tukan, Thomas M. Sant, Shannon E. McCabe, William B. West, Jr., Kirk Drennan, Yasmyne C. Ronquillo, and Phillip C. Hoopes. 2021. "Comparison of 6.0 mm versus 6.5 mm Optical Zone on Visual Outcomes after LASIK" Journal of Clinical Medicine 10, no. 17: 3776. https://doi.org/10.3390/jcm10173776

APA Style

Moshirfar, M., Huynh, R., Bundogji, N., Tukan, A. N., Sant, T. M., McCabe, S. E., West, W. B., Jr., Drennan, K., Ronquillo, Y. C., & Hoopes, P. C. (2021). Comparison of 6.0 mm versus 6.5 mm Optical Zone on Visual Outcomes after LASIK. Journal of Clinical Medicine, 10(17), 3776. https://doi.org/10.3390/jcm10173776

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