LED lamps color introduced

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Stokes shift, high-brightness white LED, blue wavelengths longer a small part. This is a good thing, because it makes the LED

light manufacturers can use many different colors of the phosphor layer to extend the emission spectrum to improve the LED

color rendering index (CRI). Phosphor white LED color rendering index, cost, because the Stokes shift will lead to the white

LED efficiency is lower than the monochrome LED efficiency. But prefer to use for most lighting applications, high-

performance color LED luminous efficiency is slightly lower. Improve the color of the LED lights.

 

Laser vision correction

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 A person s vision loss, including myopia, hyperopia, astigmatism, which is caused by the most common myopia common cause of

refractive errors.

 

    The so-called myopic refractive system, the focus gathered in front of the retina, after several twists and turns

parallel to the light did not adjust the state, did not form a clear image, lead to look at the distant and fuzzy.

    Excimer laser correction of myopia, the excimer laser to remove corneal stroma central cornea, the corneal surface

becomes more than the original unit, reduce the curvature, the focus falls on the retina of the eye image, in order to

achieve a correction effect of myopia, which is carved in corneal contact lenses. The so-called hyperopia adjust the state of

parallel light to pass through the twists and turns of the refractive system, focus gathered on the retina, there is no

formation of a clear material such as lead fuzzy look close, fatigue. Excimer laser correction of hyperopia, the excimer

laser corneal central area? The surrounding matrix, the corneal surface becomes more than the original protrusions, the

curvature increases, so that the imaging focus on the retina of the eye to the correction of hyperopia.