Posters

Agreement of a Scheimpflug-based topography and swept-source optical biometry astigmatism measurements

Poster Details

First Author: G.Neri Pires PORTUGAL

Co Author(s):    A. Vergamota   C. Marques   J. Batista   J. Silva           

Abstract Details

Purpose:

Astigmatism correction is determinant to obtain an accurate postoperative refractive outcome. The purpose is to compare the biometry parameters between a Scheimpflug-based topography (Oculus Pentacam®) and a swept-source optical biometry (IOLMaster® 700, Carl Zeiss Meditec).

Setting:

Ophthalmology Department Hospital dos Lusíadas, Lisboa, Portugal

Methods:

Study that includes patients proposed to cataract surgery with biometric parameters measured with 2 different devices: Scheimpflug-based topography (Oculus Pentacam®) and a swept-source optical biometry (IOLMaster® 700, Carl Zeiss Meditec). Astigmatism magnitude and axis were evaluated and astigmatic vector components (Jackson cross-cylinders J0, J45) were calculated. Agreement was accessed with the Bland-Altman analysis.

Results:

A total of 272 eyes of 272 patients were included, mean age 65.4±9,4 years. Mean cylinder was 0,96D with the topography, 0,93D with the biometry, mean astigmatism difference 0,03D. Mean axis difference was 1,8 degrees between the 2 devices. Mean topography J0 and J45 was 0,03D and 0,003D, respectively. Mean biometry J0 was 0,016D and mean J45 was 0,023D. Mean power vectors differences between the 2 technologies was 0,01D for J0 and 0,02D for J45. Axial length and astigmatism values greater then 3D do not influence de comparability of the results.

Conclusions:

Astigmatism magnitude, astigmatism axis and power values were comparable between the devices studied. However, some patients have important disagreement in axis location.

Financial Disclosure:

None