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Digital analysis in flap parameter accuracy and opaque bubble layer objective assessment in 100 cases of femtosecond laser-assisted LASIK: a novel technique

Session Details

Session Title: Corneal Femtosecond

Session Date/Time: Monday 07/10/2013 | 14:30-16:30

Paper Time: 14:54

Venue: Elicium 1 (First Floor)

First Author: : G.Pamel USA

Co Author(s): :    A. Kanellopoulos   G. Asimellis           

Abstract Details

Purpose:

To determine flap parameter accuracy, opaque bubble layer extent, and skip-line incidence in femtosecond laser assisted LASIK using the Alcon - WaveLight FS200 laser via optoelectronic clinical measurements.

Setting:

Laservision.gr Eye Institute, Athens, Greece

Methods:

Images from one hundred and one flaps were automatically recorded during consecutive routine LASIK procedures performed with the Alcon – WaveLight (Fort Worth, TX) FS200 femtosecond laser and the EX500 excimer laser. Digital processing of these images was employed to objectively evaluate the diameter of FS200-created flaps, by comparing planned Vs. achieved and to evaluate incidence and extent (area) of opaque bubble layer (OBL). Data were assessed using paired two-tailed t-tests, coefficient of determination (r2), trend line linearity, bias, and plots of differences against means.

Results:

The intended flap diameters were between 8.00 to 9.50 mm. The achieved flap diameters depicted extremely high precise translation, and were on average just -0.16 mm (± 0.04) smaller for the 8.00 mm intended flap diameter, -0.12 mm (± 0.03) smaller for the 8.50 mm, and up +0.06 mm (±0.06) wider for the 9.50 mm flap respectively. With an average flap area 72.4 mm2, the average OBL area was 4.1 ± 4.3 mm2 (Max, 14.34 mm2 , Min 0), corresponding to a 6% OBL-to-flap area. Specifically 80% of the femtosecond created flaps had essentially zero OBL (0 to under 2.7% of the flap area.

Conclusions:

FS200 created flaps, in our clinical experience and with this novel highly objective assessment technique, demonstrate both extreme precision and reproducibility. OBL incidence was minimal. ?

Financial Interest:

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