An Artificial Lens Capsule with a Lens Radial Stretching System Mimicking Dynamic Eye Focusing

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Materials Science

Background:

• Presbyopia, an age-related loss of the eye's focusing ability, is caused by stiffening of the crystalline lens.
• Current correction methods for presbyopia often involve intraocular lenses, but restoring natural accommodation remains a challenge.

Purpose of the Study:

• To develop and biomechanically evaluate an artificial lens capsule (ALC) and a lens radial stretching system (LRSS) to simulate human eye accommodation.
• To provide a platform for designing and verifying accommodating intraocular lenses (AIOLs) ex vivo.

Main Methods:

• An ALC was fabricated from silicone rubber to replicate the dimensions and deforming characteristics of the human lens capsule.
• An LRSS was developed and calibrated to apply radial stretch, simulating the change in capsule diameter during accommodation.
• The biomechanical performance of the ALC was assessed by analyzing its deformation and reaction force under multiaxial stretch from the LRSS.

Main Results:

• The developed ALC successfully replicated the deforming behavior of the natural lens capsule.
• The LRSS effectively simulated the radial stretching experienced during the eye's accommodative process.
• Preliminary tests on prototype ophthalmic devices demonstrated the feasibility of restoring accommodation.

Conclusions:

• The artificial lens capsule and stretching system provide a valuable tool for understanding and engineering accommodating intraocular lenses.
• This approach facilitates the design verification and development of novel ophthalmic devices to address presbyopia.