What Are the Benefits of Vertex Toric Contact Lenses?
Toric contact lenses are specially designed for people with astigmatism. 40% of people who require vision correction suffer from astigmatism. Like bifocal lenses, toric lenses come with two powers, one for astigmatism and another for nearsightedness (myopia) or farsightedness (hyperopia).
The two powers are created at different angles on the lens and for this reason vision will be obstructed if the lens moves around the eye when blinking or looking around. Toric lenses are available in frequent replacement, disposable, and daily disposable varieties. One option available for consumers is the Vertex Toric Lens.
The Vertex toric contact lens is a frequent replacement lens manufactured by CooperVision. They can typically be worn for one to two weeks before replacement. They are usually used for daytime wear but can be worn for up to seven days extended wear. They are a good choice for first time contact wearers who suffer from astigmatism. A benefit of frequent replacement is that it results in clearer vision. It is also an added convenience as the wearer will typically have another pair available should they damage or lose a lens.
Astigmatism
Vertex toric lenses provide crisp, clear vision by correcting the effects of astigmatism. Astigmatism affects the shape of the cornea, making it more egg like than round. This causes light that enters the eye to bounce around and blur vision. The lens refracts light to the retina where it belongs thus correcting the astigmatism for the wearer. The lens design provides an even surface that helps to focus even more light to the retina. The lens has a Refractive Index of 1.41 and a Light Transmittance of >96%.
The Vertex Toric is manufactured using a process that produces a perfect edge on every lens. This keeps the lens more stable resulting in less rotation. The perfect edge also makes the lens a more comfortable option and proves to provide a more consistent product.
The lens is made of a polymer called methafilcon A. This polymer is extremely water absorbent with a water content of 55%. The high moisture level keeps the lens feeling soft on the eye providing a greater level of comfort. The polymer is very durable and wears well with little risk of damage.
For ease of use, the Vertex Toric is manufactured with a light blue handling tint created by a color additive called Reactive Blue No. 4. This tint does not alter the color of the eye but makes it easy to find the lens in solution or if accidentally misplaced. They are easier to position when inserting or removing adding more benefit to the inexperienced lens wearer.
The Vertex Toric was designed to be a comfortable and stable lens for people who have had difficulty with astigmatic lenses in the past. The crisp, clear vision provided by the unique design and manufacturing process and the ease of use and handling makes them an excellent choice for prescription lens wearers.
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