May 2019


JCRS - Journal of Cataract & Refractive Surgery
In the journal: May 2019

ASCRS calculator formula accuracy of hyperopic corneal refractive laser surgery eyes in multifocal IOL implantation

Violette Vrijman, MD, Adi Abulafia, MD, Jan Willem van der Linden, PhD, Ivanka van der Meulen, MD, Maarten Mourits, MD, Ruth Lapid-Gortzak, MD
In this retrospective case series involving 64 eyes, investigators examined how patients who had previously undergone hyperopic corneal refractive laser surgery and who were receiving multifocal IOLs comparatively faired when practitioners used power calculation formulas available on the ASCRS calculator. With three of the formulas, the Masket, the Modified Masket, and the Barrett True-K, investigators used historical refractive data and compared that to the Shammas, Haigis-L, and Barrett True-K using no previous refractive data. They found that there was a range of 0.27 D2 to 0.33 D2 in the variance of the prediction error. While most of the formulas faired comparably, the Modified Masket formula had a significantly higher median absolute prediction error than the others. This formula proved to be the least accurate.

Effects of decentration and tilt on the optical performance of 6 different aspheric intraocular lenses in a model eye

Tjundewo Lawu, PhD, Koichiro Mukai, PhD, Hiroyuki Matsushima, MD, PhD,
Tadashi Senoo, MD

With this theoretical simulation, investigators considered how 6 different aspheric lenses in a model eye compared in terms of optical performance when decentration and tilt were altered. They determined that in such cases, optical performance degraded and wavefront aberrations increased. While misalignment did not affect the extent of spherical aberration, astigmatism, coma, and higher-order aberrations generated by misaligned IOLs corresponded to the amount of the spherical aberration correction of the lenses. Using a model eye, investigators determined that results were similar to their theoretical ones. They concluded that the aspheric IOL spherical aberration correction amount was linked to astigmatism, coma, and higher-order aberrations caused by IOL misalignment.

A comparative evaluation of femtosecond laser-assisted cataract surgery and conventional phacoemulsification in eyes with shallow anterior chamber

Viraj Vasavada, MS, Shail Vasavada, DO, Abhay Vasavada, MS, Vaishali Vasavada, MS, Samaresh Srivastava, DNB
This prospective randomized study compared how those with shallow anterior chambers of less than 2.5 mm fared postoperatively following femtosecond laser-assisted cataract surgery (FLACS) or conventional phacoemulsification. In the study, 91 patients were randomized to the conventional group and another 91 to the FLACS group. Investigators determined that for those in the FLACS group the cumulative dissipative energy was lower. Also, those in this group had significantly lower central corneal thickness with fewer FLACS eyes showing grade 2 anterior chamber cells and flare. With the FLACS procedure, uncorrected distance visual acuity was better beginning at the 1-week mark, at 0.089 logMAR versus 0.178 logMAR for the conventional group. While for those in the FLACS group endothelial cell density was lower, it was not a statistically significant difference. The conclusion reached was that FLACS corneas were clearer compared with those that underwent conventional phacoemulsification, had better early uncorrected visual acuity, and had lower anterior chamber inflammation.

In the journal: May 2019 In the journal: May 2019
Ophthalmology News - EyeWorld Magazine
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