IOL AcrySof® ReSTOR®
Finally a chance to say goodbye to reading glasses and bifocals
Until recently, living without reading glasses or bifocals was not an option for most of patients with cataract.
Cataract: A clouding or loss of transparency of the eye’s lens. When light passes through a lens with cataract it is scattered or diffracted. As a result patient get blurred vision.
Today patients have the choice. The IOL ReSTOR® is an exclusive technological innovation that can bring you a good quality vision throughout the visual spectrum while being independent of reading or bifocals glasses!
So far, more than 1 million ReSTOR® have been implanted worldwide for over 10 years with excellent clinical results.
How does the IOL ReSTOR® work?
In our routine activities, such as reading, watching TV or working on the computer, our eyes are constantly focusing on objects at different distances: Near, far and in all intermediate range. The ability to quickly change focus throughout this range of vision is called «accommodation».
Accommodation: Ability of the lens to change shape to focus on objects at different distances.
Unfortunately this ability weakens with age, so we have to wear reading glasses or bifocals. However, the IOL was created to provide quality vision at near and far, by combining the benefits of refractive, diffractive, aspheric and apodization technologies.
Refraction: Is the deviation of the light passing through the lens, to converge on the retina
Retina: The retina is the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain.
The refractive region of the IOL ReSTOR® deflects the light passing through the lens to a focal point on the retina. The outer part of the IOL ReSTOR® surrounds the apodized diffractive region and is dedicated to distance vision.
Diffraction: is the change in the directions and intensities of a group of waves after passing by an obstacle or through an aperture.
The central zone of IOL ReSTOR® is diffractive and thus provides a quality vision from near to distant.
Apodization: Is a technique used for years in microscopes and telescopes to improve the image quality and has been patented for use in Alcon’s IOL.
On ReSTOR® is the gradual reduction or blending of diffractive step heights. This unique technology optimally distributes the appropriate amount of light to near and distant focal points, regardless of the lighting situation.
The apodized diffractive optic of the AcrySof® ReSTOR® IOL is designed to improve image quality while minimizing visual disturbances. The result is an increased range of quality vision that delivers a high level of spectacle freedom.
Asphericity: good vision is not limited to good visual acuity. A visual acuity of 10/10 may be associated with vision difficulties in the conditions of low light intensity which contrast sensitivity becomes a major factor.
We call a lens aspherical when it shape is close to a portion of a sphere but not strictly spherical.
The spherical lenses often cause aberrations: the rays passing through the center of the optics do not converge absolutely at the same point, which can cause blurred vision when the diameter of the pupil is wide open (in low light conditions). An aspheric lens can overcome this phenomenon. As a result the asphericity on ReSTOR® lenses improves the patient’s quality of vision, the contrast sensitivity and reduces the side effects such as nocturnal halos or glare.