Evaluation of the Mechanical Properties of the Anterior Lens Capsule Following Femtosecond Laser Capsulotomy at Different Pulse Energy Settings

Abstract

Anterior capsule openings created at a high energy level were slightly weaker and less extensible than those created at low or intermediate levels, possibly due to the increased thermal effect of photo-disruption.

Safety of femtosecond laser‐assisted cataract surgery: assessment of aqueous humour and lens capsule

“…Femtosecond laser‐assisted capsulotomy had less average resistance to capsule tear than manual capsulorhexis, and a capsulotomy created at a high laser energy was slightly weaker and less extensible than that created at low or intermediate levels in ex vivo porcine possibly due to the increased thermal effect (Sándor et al. , ). The respiratory movement of the eye during femtosecond laser‐assisted capsulotomy was speculated as a potential risk factor for redial capsule tear (Schultz et al.…”

Femtosecond laser–assisted cataract surgery—current status and future directions

“…SEM revealed further smaller microgrooves and sawtooth both groups, and confirmed fewer tags and bridges, smoother edges, and a more regular and thinner demarcation line on the 5 μJ specimens compared to the 15 μJ ones 132. Using a porcine model, Sandor et al evaluated the mechanical rupture force for anterior capsulotomy specimens created using different energy settings 145. They found that the high energy group (10 µJ) had a significantly lower rupture force(108 ± 14 mN) compared to the intermediate energy (5 µJ) group (118 ± 10 mN) (P < .05) and low energy (2 µJ) group (119 ± 11 mN) (p< 0.05), but the difference between the intermediate energy and low energy groups was not significant (p=0.9) 145.…”

“…Using a porcine model, Sandor et al evaluated the mechanical rupture force for anterior capsulotomy specimens created using different energy settings 145. They found that the high energy group (10 µJ) had a significantly lower rupture force(108 ± 14 mN) compared to the intermediate energy (5 µJ) group (118 ± 10 mN) (P < .05) and low energy (2 µJ) group (119 ± 11 mN) (p< 0.05), but the difference between the intermediate energy and low energy groups was not significant (p=0.9) 145. Using scanning electron microscopy they reported a serrated capsulotomy edge with no thermal damage at low and intermediate energy levels whereas the there was melting of the serrated edge and coagulation of the collagen fibers without significant collateral damage at the higher 10 µJ energy setting 145.…”

Biomechanical properties of the anterior lens capsule after manual and femtolaser capsulotomy

“…Для оценки биомеханической «устойчивости» края передней капсулы после разных методов капсулотомии использовали кадаверные свиные [15][16][17][18] и человеческие глаза [19][20][21][22]. Сравнительный анализ этих исследований, представленный нами в опубликованном ранее обзоре литературы, позволил сделать следующие основные выводы [23]:…”