zhdety's fashion blog

As the widely use of the computer and TV under this high technology world. It is high time to take care of our eyes. Living this development of the technology and high standard life, our eye vision becomes more and poorer. And we need to see doctor to exam eye vision with eyewear.

When the eye vision with eyewear chooses the lenses for their eyeglasses, they should choose the function of the lenses carefully.  Under certain conditions the normal eye has not one but two blind spots. The 5° by 8° blind spot that represents the optic disc is always present; however there is an area of about 1° in the center of the fovea that contains only cones. The cone retinal receptors only function at higher levels of illumination i.e. daylight, which is photopia vision and at “twilight” levels, which is myopic vision. At low levels of illumination only the rods are able to function. This is called night or isotopic vision. During night vision the central 1° of the visual field is functionally blind because the cones are insensitive to such low levels of illumination. Interestingly, since rods are insensitive to red light, red lights at low levels of retinal illumination are invisible.

The customer services in eyeglasses online store recommends eye vision with eyewear choose the lenses of transmission of 15 percent across visual.  This yields a gray or neutral shade, and should not be dark enough to cause a shift to scotopic (i.e. night vision) retinal functioning, nor should it affect color discrimination in pilots with normal color vision.

It is very significant for aviator choose the color of the lenses for eye vision with eyewear. Sun lenses that selectively block some wavelengths of visible light can be a problem for pilots because they can give rise to mild color discrimination difficulties in individuals with normal color vision and may greatly reduce color discrimination in those with severe color vision defects. Because of this, an ideal tint should evenly reduce transmission across the visible spectrum.

Different people have difference prefers. And most of the pilots prefer “blue blocker” more. Large numbers of the colors of the lenses for eye vision with eyewear choose. www.firmoo.com has offered much of the styles of the eyeglasses for every customer.

You may be interested in these eyeglasses：polarized progressive sunglasses