Back to Freepaper Session

Corneal astigmatism as measured by anterior and total corneal power

Session Details

Session Title: Assessment of Astigmatism

Session Date/Time: Saturday 05/10/2013 | 11:00-12:30

Paper Time: 11:18

Venue: Main Lecture Hall (Ground Floor)

First Author: : M.Goggin AUSTRALIA

Co Author(s): :    T. Greenwell   Z. Katherine   A. Paul        

Abstract Details

Purpose:

To compare measurements of anterior and total corneal astigmatism to refractive astigmatic in patients with spherical IOL’s

Setting:

Publicly funded hospital and private hospital

Methods:

40 eyes of 27 patients underwent coaxial microincision cataract surgery receiving a spherical intraocular lens implant. Manifest subjective refraction was determined at least 6 weeks postoperatively. At the same visit corneal measurements were obtained using a Nidek keratometer (Nidek Co., Gamagori, Japan) and one of two rotating Scheimpflug cameras (Pentacam, Oculus Inc., Wetzlar, Germany; or Precisio, iVis Technologies, Taranto, Italy). Ocular residual astigmatism (ORA) was defined by comparing the refractive outcome and corneal power measurements using vector analysis.

Results:

The ORA using Scheimpflug total corneal power was 0.6 dioptres (D) (SD = 0.2) for Pentacam and 0.9 D (SD = 0.5) for Precisio. ORA using Nidek keratometry was 0.7 D (SD = 0.5). ORA using Scheimpflug anterior corneal power was 1.3 D (SD = 0.9) for Pentacam and 1.0 D (SD = 0.6) for Precisio.

Conclusions:

Accounting for anterior and posterior surface curvature in calculating corneal power may provide more accurate prediction of ocular residual astigmatism compared with anterior corneal power alone.

Financial Interest:

NONE