Topography-modified refraction (TMR): partial to total adjustment of treated cylinder amount and axis provided by topography data measured vs using the standard clinical refraction in myopic topography-guided LASIK

Session Details

Session Title: Presented Poster Session: Refractive Surgery New Techniques/Instrumentation/Devices I

Venue: Poster Village: Pod 2

First Author: : A.Kanellopoulos GREECE

Co Author(s): :                           

Abstract Details

Purpose:

The purpose of this study is to compare the outcomes of 50% and 100% Topography-Modified Refraction (TMR) to each other and to the standard clinical refraction in patients having myopic topography-guided LASIK for myopia.

Setting:

LaserVision.gr Clinical and Research Eye Institute, Athens, Greece

Methods:

In this contralateral, prospective randomized consecutive case series, 296 eyes (148 patients) have undergone myopic (with corresponding astigmatism) topography-guided LASIK. One eye of each patient (Group-A) was treated with the standard clinical refraction (sphere, cylinder and axis), while the contralateral eye with: either 50% Topography-modified refraction (TMR) (group-B); or 100% Topography-modified refraction (TMR) (group-C); The 3 months peri-operative visual performance and refractive data were compared for all three groups.

Results:

Mean pre-operative refractive error was: −5.5 D of myopia and −1.75 D of astigmatism. In average numbers at 3 months: UDVA: group A was 20/20, group B 20/18 and 20/16 for group C; CDVA: 20/20, 20/16.75 and 20/13.5 respectively; 1 line of vision gained: 27.8%, 41.7% and 55.6%; 2 lines of vision gained was 5.6%, 8.7% and 11.1% also respectively. In-group A, 27.8% of eyes had over −0.50 diopters of residual refractive astigmatism, 17.7% in group B (P<.01) and to 11.7% in group C(P<.01). All values were statistically different when group B was compared to group C.

Conclusions:

Topography-modified refraction (TMR) used in myopic topography-guided cases, appears superior to clinical refraction used. Complete adherence to the topography cylinder amount and axis appears to offer the best outcomes in this contralateral eye comparison.

Financial Disclosure:

None