What I am mediating in my project is the environmental issue of light pollution. Light pollution is excessive artificial light. Light pollution brightens the night sky in the residential areas, and excessive brightness can cause visual discomfort. High glare will reduce visibility. Bright, chaotic and excessive light sources cause the city's sky to shine, which is very dazzling.

I ask: What kind of light is most harmful to the eyes?

UV: Ultraviolet light is composed of three parts, divided by wavelength, namely UVA, UVB, UCC. UVA and UVB are very harmful to our eyes. About 15% of UV-A will reach the retina, which will hurt the retina. 70% of UVB will be absorbed by the lens, and 30% of UVB will be absorbed by the cornea, so it will hurt the lens and the cornea.

Blu-ray: Humans are inseparable from blue light because blue light can help people adjust the biological clock, regulate the sleep cycle, and regulate emotional control. However, some of the light sources release a large amount of blue light, which is very harmful to the eyes, such as Yuba, LED lights, computers, mobile phones, etc. The central part of the retina is covered by yellow pigments (Macula Lutea), which serve as a filter for incoming blue light because its absorbance peak in this range.¹

Glare: Glare mainly comes from sunlight and strong light. Reflections on smooth surfaces (such as highway pavements or water surfaces, computer screens, etc.) are also glare. Glare can make your eyes feel stinging on a dark night.

How does different light harm the body? Sunshine: 1) Invisible light-Ultraviolet light (light invisible to the human eye), with a wavelength range of 250-400 nanometres. Ultraviolet rays are divided into three categories: Long-wave ultraviolet, UV-A: 315-400 nanometres. Medium-wave ultraviolet, UV-B: 280-315 nanometres. Short-wave ultraviolet, UV-C: 250-280 nanometres. UV-C rarely reaches the ground and can be ignored. 2) Visible light (light that can be seen by the human eye), the wavelength range is 400-750 nanometres, the main components are red, green, and blue light. 3) Invisible light-near infrared (light invisible to the human eye), the wavelength range is 750-2500 nanometres.

Near-infrared is a type of infrared, and infrared with a wavelength above 2500 nanometres is called mid-infrared and far-infrared. Ultraviolet rays, blue rays, and near-infrared rays have an impact on human health. These lights can affect human health only when exposed to high intensity or prolonged exposure. For example, people who work outdoors in plateau areas or long sunlight areas have darker skin and are prone to eye diseases such as cataracts. Infrared rays are easily absorbed by water. Excessive amounts of infrared rays are absorbed by the lens of the human eye when they gather. Over time, the lens will degenerate and cause cataracts.

Fluorescent lighting: Due to the light-emitting principle of fluorescent lamps, ultraviolet light in the tube excites fluorescent powder on the inner wall of the tube to generate white light, and there is ultraviolet leakage.

LED Light: High blue light content may cause retinal damage, and blue light radiation with a colour temperature below 3500K is safer. (K is the unit of colour temperature. <3000K is warm light (reddish white), 3000-5000K middle (white), > 5000K cool type (white with blue))

How I will do: I want to make a video that focuses on my eyes. The video started of darkness, and then a white light appeared. With the change of the white light, you can vaguely see that white light is mixed with other colours of light, and these other colours of light symbolise the different wavelengths of light that are visible in the ordinary life. These different lights have different effects on the eyes, and the eyes respond accordingly. Then, the white light will change into different colours. These different colours of light symbolise lights of different colour temperatures. Similarly, different colour temperatures have different effects on the eyes, and different reactions of the eyes to different lights symbolise different effects of different colour temperatures on the eyes. I added sound to the video. As time goes by, the sound goes faster and faster, which also means that the eyes are becoming more and more uncomfortable. The video focuses on the reaction to the eyes, highlighting the damage caused by light pollution to the human eye. Many types of light can cause serious damage to the eyes and have different wavelengths. Some are visible and some are invisible. Different colours of light are different types of light that are harmful to the eyes. When the colour of the light changes, the eye reacts differently, highlighting the different types of light that cause damage to the eye.

How the eyes feel: At beginning, the eyes felt okay. After a long time, the eyes felt very dry. I couldn't help blinking. When the colour changed, the eyes became uncomfortable. The eyes gradually felt unable to open. When the colour changes, the discomfort is very obvious, and the eyes can't be opened. At lasts, just want to close my eyes.