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Our eyes allow us to see the world around us by taking the light rays that enter the pupil and bringing them into focus on the retina. In low light conditions like night-light driving the pupil dilates to allow more light to enter. When this occurs, rays passing through the outer edges of the pupil may be refracted to a greater degree than the central rays resulting in loss of focus. This is called spherical aberration.
Spherical aberration is a very common condition that may cause patients to experience blurred vision, halos or glare, especially in low light conditions.
Not all contact lenses compensate for spherical aberration; in fact some spherical contact lenses do not reduce spherical aberration effectively across all powers and in some cases may make it worse.
Bausch + Lomb PureVision2 HD contact lenses with high-definition optics are designed to reduce spherical aberration across a broad range of available powers and the halos, glare, and blur that can be associated with it.
Utilizing aspherical lens surfaces to control how the light reaches the retina, these advanced optical designs help ensure patients enjoy incredible crisp and clear vision - even in low light.
For the astigmatic eye the refractive correction requires compensation in two power meridians.
Available since March 2009, Air Optix Night and Day Aqua is the successor of the popular CIBA Vision Day and Night.
With one of the highest Dk/t values in the market (Air Optix Night & Day has an oxygen transmissibility value of 174) these lenses are destined to re-shape the silicone hydrogel lens market. They are indicated for daily wear or extended wear for up 30 continuous nights!
Like Air Optix Aqua, they are featuring the CIBA Vision Aqua Moisture System for additional comfort on contact.
Does 1-DAY ACUVUE® MOIST® stand up to 1-DAY ACUVUE® TruEye? Latter one was the first daily-wear disposable contact lens made from a new silicone hydrogel material (Narafilcon A), which promises more comfort and better wetting. We have looked at the technical parameters and are comparing some other important contact lens parameters and features.