https://opticquiz.com/learn/ Plain-English guides to vision, eye tests, and how they work. en https://opticquiz.com/learn/is-blue-light-bad-for-your-eyes/https://opticquiz.com/learn/is-blue-light-bad-for-your-eyes/Screen blue light doesn't damage your eyes, and blue-light glasses aren't proven to help. Here's what really causes eye strain.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/am-i-colorblind/https://opticquiz.com/learn/am-i-colorblind/Am I colorblind? Common signs include confusing reds, greens and browns, muddy traffic lights, and not seeing numbers others see in dot images. Take a free color vision test to check.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/can-color-blindness-be-cured/https://opticquiz.com/learn/can-color-blindness-be-cured/Can color blindness be cured? Inherited color blindness is permanent and cannot be cured. Color-boosting glasses help some people tell confusing colors apart but don't restore normal vision.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/what-does-a-dominant-eye-mean/https://opticquiz.com/learn/what-does-a-dominant-eye-mean/Your dominant eye is the one your brain favors for aiming and judging direction, like handedness. About two-thirds of people are right-eye dominant. Find yours with a quick guided test.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/how-to-test-astigmatism-at-home/https://opticquiz.com/learn/how-to-test-astigmatism-at-home/To check for astigmatism at home, view a fan of radial lines: if some directions look darker or sharper than others, it suggests astigmatism. It can hint but can't measure your prescription.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/what-is-the-eye-blind-spot/https://opticquiz.com/learn/what-is-the-eye-blind-spot/The eye's blind spot is a small area of the retina where the optic nerve exits, with no light receptors, so images there aren't seen. Everyone has one; the brain fills the gap. Find yours.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/screen-distance-and-eye-strain/https://opticquiz.com/learn/screen-distance-and-eye-strain/Sit about an arm's length (50-70 cm) from a monitor with the top at or just below eye level, and follow the 20-20-20 rule to ease eye strain. Viewing distance also affects on-screen vision tests.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/night-vision-and-contrast/https://opticquiz.com/learn/night-vision-and-contrast/Trouble seeing at night or in fog is often a contrast-sensitivity issue rather than sharpness, and can come with age, cataracts, or dry eye. Learn what to check and test your contrast.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/color-blindness-explained/https://opticquiz.com/learn/color-blindness-explained/Color blindness explained in plain English: the types (protanopia, deuteranopia, tritanopia), what causes it, how common it is, and how it looks in daily life. Test your color vision free.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/how-ishihara-plates-work/https://opticquiz.com/learn/how-ishihara-plates-work/How Ishihara plates work: why a hidden number appears or vanishes in a field of colored dots, the different plate designs, and what an online plate test can and cannot tell you.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/visual-acuity-and-20-20/https://opticquiz.com/learn/visual-acuity-and-20-20/What 20/20 vision actually means: Snellen fractions decoded, why 20/20 isn't perfect vision, what 20/40 or 20/15 mean, and whether you can test visual acuity accurately on a screen.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/contrast-sensitivity-vs-acuity/https://opticquiz.com/learn/contrast-sensitivity-vs-acuity/Contrast sensitivity vs visual acuity: why you can have 20/20 and still struggle in fog, glare, and dim light, what contrast sensitivity measures, and why it can change first.Sun, 06 Jul 2026 00:00:00 GMT https://opticquiz.com/learn/glossary/https://opticquiz.com/learn/glossary/A plain-English glossary of vision and eye-test terms: visual acuity, Snellen, logMAR, contrast sensitivity, JND, Ishihara, protan/deutan/tritan, anomaloscope, hyperacuity, flicker fusion, and more.Sun, 06 Jul 2026 00:00:00 GMT