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Accelerated Stabilization Design (ASD)
Accelerated Stabilization Design (ASD) is a type of technology developed for toric contact lenses to combat astigmatic blur. Astigmatic blur occurs when the contact lens shifts out of place due to rapid eye or head movements, or low-light conditions.

ASD technology harnessesthe natural pressure of a blink to secure the lens in place and realign the lens if it rotates out of position during head and eye movements. Because of its ability to rotate and realign quickly, toric contact lenses with ASD technology is ideal for contact lens wearers who experience fluctuations in their vision.

Astigmatism

Astigmatism is a condition caused by an irregularly shaped cornea, which causes light rays to focus on two points in the back of your eye, rather than on just one. An astigmatic cornea, is shaped more like an oblong football, rather than the normal spherical baseball-shaped cornea. Regular astigmatism is easily corrected with eyeglasses or contact lenses.

How ASD Works

Contact lenses with ASD technology work with the eyelids to balance and realign the lens when it rotates out of position. The accelerated slope of thickness of ASD technology prevents the lens from competing with the eyelids’ movements, instead harnessing the power of a blink to re-orient and stabilize the lens quickly.

Traditional contact lenses that feature a prism ballast design rely primarily on the force of gravity to align the lens on the eye. The prism ballast design features a lens which has continuously increasing thickness in a downward direction. This design causes the lens to work against the blinking motion of the eyelid, which results in temporary visual acuity problems.

Benefits of Contact Lens with ASD technology

Increased visual acuity: ASD technology provides enhanced stability, which in turn increases visual acuity for contact lens wearers.

Quicker fitting process: As contact lenses with ASD technology are designed specifically to harness the power of a blink to stabilize the lens, it allows the contact lens to settle into place almost instantly. In comparison, traditional toric contact lenses without ASD technology require a 15-minute settling period before the fit can be assessed.

Studies on ASD Technology

A study led by Vistakon®, a division of Johnson & Johnson Vision Care, compared the rotational stability of two differently-designed toric soft contact lenses over a range of natural viewing conditions. 10 men and 10 women aged between 23-55 years old participated in the double-blind, randomized, crossover study. Participants were randomly fitted with one of the two types of toric lenses – Acuvue Advance Brand Contact Lenses for Astigmatism, which features an Accelerated Stabilization Design (ASD), and Bausch&Lomb SoftLens Toric, which features the Prism Ballast Design.

Participants in the study were asked to perform four tasks involving quick, simultaneous movements of both eyes in the same direction. They were then assessed by lens settling time, ease of reading, visual search and large versional tasks.

The results of the study showed that the contact lenses featuring ASD technology were significantly more stable than the contact lenses with the Prism-Ballast Design during settling time and during the large versional tasks that required the eyes to move synchronously and symmetrically in the same direction. Performance was similar for the reading and visual search categories.

More information on the study can be found on Medical News Today.

Types of contact lenses with ASD Technology

Johnson and Johnson’s 1-day Acuvue for Astigmatism and Acuvue Oasys for Astigmatism are the first type of contact lenses that feature ASD Technology.