Blue-ray will cause diffusion and flickering in the vision The shorter the wavelength, the more energy light waves, which are more likely to cause eye fatigue. Blue light, which is next to ultraviolet light on the electromagnetic spectrum, has a shorter wavelength than other visible light. Besides, it also tends to be diffused. Therefore, it is considered to be the cause of visual flicker.
General computer spectroscopic map
The shorter the wavelength, the more energy light waves, which are more likely to cause eye fatigue. Blue light, which is next to ultraviolet light on the electromagnetic spectrum, has a shorter wavelength than other visible light. Besides, it also tends to be diffused. Therefore, it is considered to be the cause of visual flicker.
How much blu-ray does the phone screen produce?
Mobile phones have become everyone can not leave the electronic products, many people like to go to bed before turning off the lights to play with mobile phones, it seems that this is more feeling. Brushing our phones in the dark can ruin our eyes in minutes, and the culprit is the invisible short-wave blue light.
Iphone 11 screen spectrogram
See that? In the spectral image of the phone screen, with wavelengths between 380-500nm, blue light has a distinct peak, which is the short-wave blue light that hurts our eyes the most. Brushing your phone in the dark often feels sour eyes, and it's thanks to it, and prolonged blue light damage is likely to cause irreversible damage to our vision health.
PD is the distance between your two pupils in millimeters. Having a correct PD on your glasses ensures that you are looking through the ideal spot in your lenses. If there is no PD on your prescription, you can check it with your doctor or measure it yourself.
Sphere(SPH) refers to the refractive correction in the prescription. Minus(-) values are for nearsightedness, and Plus(+) values are for farsightedness. If "PL" or "Plano" is written for the either SPH on your prescription, then you should select "0.00".
CYL(Cylinder) & Axis
Cylinder(CYL) refers to astigmatism. It can be either positive(+) or negative(-). Axis is recorded as an angle in degrees, between 0°and 180°. Therefore, if there is a CYL value on your prescription, then there must be an Axis for it.
If "DS" or "SPH" is noted for the either CYL on your prescription, it means you have no astigmatism.
The number sometimes written as "NV" or "Reading Addition" refers to near vision and is used for multifocal lenses and readers.
Prism is power, measured in diopters, used to correct vision displacement, like double vision or an eye turn. Most eyeglass prescriptions do not have prism correction. A prescription with prism will have two values per eye: a Prism (power) and Base (direction).
Please confirm whether your prescription data matches. If it is correct, please click 'Confirm' to continue.