How accurately does the VICTUS femtosecond laser register axis without marking for astigmatic keratotomies?

Session Details

Session Title: Toric IOL Calculations & Alignment

Session Date/Time: Sunday 23/09/2018 | 08:00-10:00

Paper Time: 09:44

Venue: Room A5

First Author: : M.Dimitry UK

Co Author(s): :    H. Naveed   R. Krishnan   T. Poole              

Abstract Details

Purpose:

To compare the accuracy of VICTUS femtosecond laser axis registration with conventional slit lamp axis measurement.

Setting:

Frimley Health NHS Foundation Trust, Camberley, UK

Methods:

Retrospective case series of patients who underwent femtosecond laser assisted cataract surgery with astigmatic keratotomies without marking. Patients were assessed post-operatively for axis of astigmatic keratotomy on slit lamp by two observers. A mean of both observer readings was used to compare slit lamp reading with axis registered by VICTUS. Unaided logmar distance visual acuity was assessed as well as spectacle independence for distance.

Results:

13 patients were assessed and 18 eyes received astigmatic keratotomies. There were 7 females and 6 males with a mean age of 72.8 years. The mean angle difference was 4.86 +/- 3.91 degrees (range 0.25-15.25) between the axis registered by VICTUS and the measured axis at the slit lamp. A mean delta K of 1.8 dioptres was corrected with femtosecond astigmatic keratotomies. Mean unaided logmar distance visual acuity was 0.075 (range 0.0 to 0.2) in patients with no co-pathology. 2 eyes had co-pathology and 1 eye had a refractive aim for reading. 9 patients were spectacle independent for distance post-operatively.

Conclusions:

The VICTUS femtosecond laser registers axis with accuracy with no prior marking. Studies have shown that errors of 2-5 degrees in manual marking for toric lenses can be reduced by digital marking however this does not lead to better uncorrected vision. Patients undergoing cataract surgery with astigmatic keratotomies have good post-operative unaided logmar visual acuity and spectacle independence without prior marking.

Financial Disclosure:

... travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented