Depth Analysis: How to Scientificly assess your vision and health?
Visuality is the most important sensor of human perception of the world. In today's digital survival, we've faced the screen more than eight times a day. Hours, it put an unprecedented strain on our eyes. You can create eye health files by regular online self-testing.
Scientific principles of Snellen E-View Table
Snellen Visual Watch is the international standard invented by Dutch ophthalmologist Herman Snellen in 1862. This tool uses Random E Word mode, test your E by adjusting the physical size and rotation angle of the word Minimal resolution (MAR) 。
Standard "1.0" or "20/20" vision means you can tell 1 at a specified distance The visual details of the fraction radians. If you can see the smaller E. Words, which indicate that your eyesight is very sharp; Conversely, there may be near-sighted, distant or weak vision.
2. Why does dispersive self-measurement need to be carried out?
Astigmatism Often, the uneven radians of the agular or crystal-shaped surfaces prevent light from gathering into a focal point on the retina, but rather form multiple focal lines. This leads to a re-emergence, blurry or distortion of the object when looking at it.
In our screech test maps, all radiation lines should have the same fine and colour depth. If you find some axis-direction lines (e.g. vertical or horizontal) darker and clearer than others, this is usually a visible signal of light dispersion. Severe light-scatters can cause headaches, fatigue and even damage to driving safety.
3. Comparative sensitivity: neglected visual dimensions
Many people have had good results in traditional visual watch tests, but feel extremely tired when driving at night or travelling in the fog. This is because their "comparison sensitivity" has declined. It reflects the ability of the eyes to discern the small brightness differences between the object and its background.
- Early warning: Relative sensitivity tends to decline earlier than the value of the visual table.
- Eye screening: It is an important early indicator of the common eye disease in old age, including cataracts, glaucoma or yellow-stained variability.
4. A guide to eye-to-eye protection in the digital age
The long-term exposure to computers and mobile phones can lead to “digital visual fatigue” (CVS). To protect your vision, the following principles are recommended:
- 20-20-20 Gold Code: For each 20 minutes of eyes, look 20 feet away (about 6 metres) 20 seconds away, and let the lashes relax completely.
- Screen position optimization: The centre of the screen should be below the horizon 15-20 degrees and approximately 50-70 cm from the eye.
- Environment light: Avoid using flash screens in a black environment. The light should broadly match the brightness of the screen to reduce the contrast pressure.
- Increase in outdoor activities: Research shows that 2 hours of outdoor activity per day can effectively prevent the emergence and development of near-sightedness among adolescents.
5. The expert reminds that when must a doctor be visited?
Online tools are used only as daily monitoring. If you have any of the following symptoms, please immediately seek the assistance of a professional ophthalmologist:
- Visual deformation: Look at the line bending or breaking.
- Missing view: A fixed shadow or a sense of cover in the vision.
- Flash: Unusual flashes of light are observed either in the closed eyes or in the dark.
- Scattered vision: The sight has been significantly reduced and is not restored in a short period of time.
The windows that guard the mind start with knowing your own vision. The KiloCell are dedicated to providing you with the most convenient digital health tool.