Posters

New single-piece aspheric diffractive trifocal intraocular lens optic power calculation

Poster Details

First Author: M.Konovalova RUSSIA

Co Author(s):    K. Pershin   N. Pashinova   A. Tsygankov   M. Konovalov           

Abstract Details

Purpose:

Analysis of the effectiveness of 6 formulas for calculating the optical power during the implantation of a new single-piece aspheric diffractive trifocal intraocular lens

Setting:

«Eximer» eye center, Marksistskaya str. 3/1, Moscow, 109147, Russia/ Konovalov eye center, 3-ya Tverskaya-Yamskaya str., 56/6, Moscow, 125047, Russia

Methods:

The retrospective study included 65 patients (100 eyes) with presbyopia who underwent cataract phacoemulsification or refractive lensectomy with the implantation of the new AcrySof PanOptix® trifocal multifocal IOL. A comprehensive preoperative examination was performed. The optical power of the IOL was calculated using the formulas SRK / T (35%),Holladay 2 (18%),Hoffer Q (9%),Haigis (22%) and Barrett Universal II (16%). A retrospective analysis of the effectiveness of the Barrett Universal II, Haigis, Hoffer Q, Holladay 2, Olsen and SRK / T formulas was carried out using appropriate constants. The optical power range of implanted IOLs ranged from 13 to 30 diopters.

Results:

The smallest mean absolute error(MAE) is defined for the Barrett Universal II formula.The MAE were significantly lower when using the Barrett Universal II formula than for Hoffer Q (p=0.001),Holladay 2 (p=0.007) and SRK/T (p=0.023), and using the Olsen formula is significantly lower than for Hoffer Q (p=0.008), Haigis (p=0.017) and SRK/T (p=0.029). The highest percentage of achieving target refraction of ±0.25 D is shown for the Barrett Universal II(67%) and Olsen(62%) formulas. For the other formulas the percentage was less than 50%. The frequency of achieving target refraction of ±1.00 D for all formulas was over 90%, ±2.00 D-over 95%.

Conclusions:

The smallest values ​​of the mean absolute error and the highest frequency of achieving target refraction are shown for Barrett Universal II and Olsen formulas. These formulas can be recommended for use in the clinical practice of ophthalmosurgeons.

Financial Disclosure:

None