Tensile strength of a novel femtosecond laser capsulotomy with capsular nubs to guide toric IOL alignment

Session Details

Session Title: Presented Poster Session: FLACS

Venue: Poster Village: Pod 1

First Author: : M.Jackson USA

Co Author(s): :                           

Abstract Details

Purpose:

To study the biomechanical strength of femtosecond laser-assisted capsulotomy with IntelliAxis-L steep axis capsular marks (CM) to guide toric IOL alignment and compare it with the biomechanical strength of standard femtosecond laser-assisted capsulotomy.

Setting:

In-house experimental laboratory at LENSAR Inc.

Methods:

This non-clinical study included 36 porcine eyes, which were randomly assigned to 3 cohorts of 12 eyes each: capsulotomy with IntelliAxis-L steep axis CM for studying (1) in-line or (2) transverse tensile strength and (3) standard capsulotomy (control). Geometric characteristics of CM parameters were sweep angle 10°, tightness 0.2 and depth 0.3 mm. Capsulotomy diameter was 5 mm. Tensile strength was tested by inserting two stretcher pins into the capsular bag. During the elongation of the capsular rim, the capsular edge was stretched until rupturing. The outcome parameters were force-displacement patterns, maximum break force and maximum extensibility at breaking force.

Results:

Force displacement patterns of the capsular rims with the CM were equivalent to those of standard capsulotomy. Mean±SD break forces for standard, transverse load and in-line load groups were 180.57±22 mN, 178.04±20 mN and 181.05±15 mN respectively. These values were found to be statistically comparable for all groups (p>0.05). Mean±SD maximum extensibility for standard, transverse load and in-line load groups were 6.47±0.33 mm, 6.49±0.45 mm and 6.3±0.47 mm respectively (again found to be comparable for all groups).

Conclusions:

The capsular rim for capsulotomy with IntelliAxis-L steep axis CM was found to be equivalent in elongation and tensile strength (ability to elongate and resistance to tearing under a radial force) to the standard capsulotomy without capsular marks.

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented