High Definition Lenses
Are a new wearer and feel dissatisfied with how well you see? Even if you have worn glasses for years, you should consider high-definition lenses. Problems can occur even with an accurate prescription. This is due to the optical characteristics of your eyes and the optical limitations of conventional eyeglass lenses. When this occurs it is known as aberration. Simply defined, an aberration is an influence that will effect how light rays are pointed inside the eye.
The quality of your lens design and material will have a direct impact how well you see. Recent advances in lens manufacturing technology have created new lens types that address problems with aberrations. These lenses are designed to provide sharper vision in all lighting conditions with both single vision and progressive lenses.
Having a anti-reflective coating applied to your lenses will reduce reflections and glare on the surface of the lenses and improve vision even more. The visual benefits of lenses with anti-reflective coating include sharper vision with less glare when driving at night and greater comfort during prolonged computer use. Anti-reflective coatings also is a good idea for sunglasses. It eliminates glare from sunlight reflecting into your eyes from the back surface of tinted lenses when the sun is behind you.
When lenses are exposed to UV light, trillions of photochromic molecules in the lens begin to change structure. This reaction is what causes the lenses to darken. All lenses that adapt to light use photochromic molecules. Each formula is integrated into the surface of the lens. These molecules constantly and smoothly re-calibrate so the optimal amount of light reaches your eyes whether you’re in bright sunlight, under cloud cover or indoors. That’s why they change when you’re in the sun yet remain clear indoors.
When the lenses become cold the molecules begin to move slowly. This means that it will take somewhat longer for the lenses to adapt from dark to clear. When the lenses become warm the molecules speed up and become more reactive. This means that they will fade back faster. It can also mean that if you’re outside on a hot sunny day, but sitting in the shade, your lenses will be quicker to detect the diminished UV rays and lighten in color. Whereas, if you are outside on a sunny day in a cold climate, and then move into the shade, your lenses will adjust more slowly than they would in a warm climate.
In the car, the glass in car windshields blocks most UV light. That’s why most photochromic lenses do not provide sufficient darkening in the car. The special photochromic molecules in Transitions XTRActive lenses responds to both UV light and natural (visible, clear or white) light, so they are able to darken in the car – something no clear lens can do. It is important to note, this brand is different from the standard transition lenses and should be requested specifically by brand name. Also, they will always have a slight tint indoors since they are light activated.