The Light Adjustable Lens
Light Adjustable Lens Background
At CODET, we are committed to giving you access to the best possible technology available worldwide. Although many vision centers in North America offer great technology in premium intraocular lenses (IOLs), currently, CODET is the only vision center to offer the most technologically advanced IOL available on the market: the Light Adjustable Lens (LAL, by Calhoun Vision, Inc.). The LAL is an IOL whose optical power can be adjusted with a beam of light after standard cataract removal and subsequent IOL implantation.
The LAL was born out of the idea that an adjustable IOL was needed to solve the pervasive problem seen after many cataract removal and subsequent IOL implantations, in which uncorrected residual refractive errors persist. Dr. Robert Grubbs of California Institute of Technology and his theory of olefin metathesis, for which he won the Nobel Prize in Chemistry in 2005, allowed this idea to become a reality. Because the LAL is made from a unique material, its optical power can be adjusted with the application of light through the redistribution of molecules according to the properties of Dr. Grubbs' theory.
Dr. Chayet was instrumental in the development of the LAL. Having conducted over 500 clinical trials before ever having executed a private case, Dr. Chayet is by far the most experienced Cataract & Refractive Surgeon in the LAL worldwide.
About the Light Adjustable Lens
Intraocular lenses (IOLs) have been used in cataract surgery for dozens of 60 years. Standard monofocal IOLs allow some patients to have good distance vision, but the great majority of patients are left dependent on glasses for optimal distance and reading vision.
While newer IOL designs such as ‘multifocal’ or ‘accommodating’ lenses have begun to address the need to deliver good vision at various distances, they still cannot predictably yield optimal outcomes. In some cases, patients have to undergo additional surgical procedures such as LASIK after their cataract surgery to achieve better results.
Calhoun Vision’s LAL® addresses the unique visual needs of each lens replacement patient by allowing for precise, customizable vision after surgery with a safe, noninvasive treatment that typically lasts less than two minutes.
The LAL® design is similar in many respects to conventional intraocular lenses with which cataract surgeons all over the world are very familiar. What makes the LAL® different is the unique nature of the lens material. One component, a proprietary biocompatible material, is sensitive to a certain wavelength of ultraviolet light. When the lens is exposed to such light using Calhoun Vision’s light delivery device, the material is photopolymerized causing the shape and hence the power of the lens to change. The cataract surgeon has full control of the treatment and can give the patient excellent reading, intermediate and distance vision. Patients usually return to their normal daily activities within three weeks after their cataract is surgically removed.
The Light Adjustable Lens Procedure
The LAL® procedure begins when the lens is implanted in the patient’s eye during surgery using conventional cataract surgery techniques. Typically in about two weeks, when the eye has healed, the surgeon will evaluate the patient’s vision. If the surgeon decides to adjust the power of the lens to give the patient sharper, more precise reading or distance vision, he will seat the patient comfortably at Calhoun Vision’s digital light delivery device, a machine specially designed to deliver the exact dose and profile of light onto the LAL®.
The doctor then applies a safe, non-invasive and painless stream of light through the eye and onto the LAL®. The light causes the lens to change shape and optical performance to the precise visual outcome needed by the patient. This is accomplished in under two minutes of exposure to the beam of light.
After the first light treatment, the patient returns in a few days, and if a further minor adjustment is required to fine tune vision an additional treatment is performed. When the patient and doctor are happy, the lens power is ‘locked in’ by a similar application of light, leaving the patient with the quality of vision customized to their unique anatomy and visual requirements.