Posters

Subjective and objective postoperative astigmatism using Barrett Universal II and toric calculator formulae and digital marking

Poster Details

First Author: N.Pesztenlehrer HUNGARY

Co Author(s):    V. Banfi   R. Marko                 

Abstract Details

Purpose:

To evaluate the accuracy of Barrett toric calculation formula using digital marking in aspects of subjective and objective postoperative refractions compared to the calculated values.

Setting:

Petz Aladar County Hospital, Gyor, Hungary

Methods:

53 cases with T-IOL implantation performed by 1 surgeon were evaluated. Measurements were performed with optical biometry, auto kerato-refractometry, SIA and lens factor for spherical IOL calculation with Barrett Universal II formula were updated/personalized. Toric IOL calculations were made with Barrett Toric formula, digital marking was used in every case. Patients with calculated postoperative astigmatism higher than 0,5D were enrolled.  Refractions were measured at least 4 weeks postoperatively.

Results:

The magnitudes of mean subjective and objective astigmatism were 0,08D (SD:0,20D; median: 0,0D; range: 0-0,75D; CI95%: 0,02-0,13D) and 0,46D (SD: 0,38; range: -1,75D to +0,5D; median: 0,5D; CI95%: 0,36-0,56D), respectively. The mean Barrett calculated astigmatism was 0,1D (SD: 0,12D; range: -0,72D to 0,23D; CI 95%: 0,07-0,13D). Although no significant differences were found among the calculated, subjective and objective postoperative astigmatism after converting the results in J0 and J45 (p>;0,1), the analysis of magnitudes of every group showed significant differences (p≤0,01).

Conclusions:

Using toric calculation formula concerning the posterior curvature of the cornea and digital marking for T-IOL implantation, we were able to achieve good subjective and objective astigmatism results, with J0 and J45 conversion no statistically significant difference was found among the groups. However the difference in magnitude of astigmatism showed inconsistency, the clinical results are dominantly within the expected range.

Financial Disclosure:

... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented