Reference Terms
from Wikipedia, the free encyclopedia
Contact lens
A contact lens (also known simply as a "contact") is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye.
Contact lenses usually serve the same corrective purpose as conventional glasses, but are lightweight and virtually invisible - many commercial lenses are tinted a faint blue to make them more visible when immersed in cleaning and storage solutions. Cosmetic lenses are deliberately colored for altering the appearance of the eye.
It has been estimated that about 125 million people use contact lenses worldwide (2%), including 28 to 38 million in the United States and 13 million in Japan. The types of lenses used and prescribed vary markedly between countries, with rigid lenses accounting for over 20% of currently-prescribed lenses in Japan, Netherlands and Germany but less than 5% in Scandinavia.
People choose to wear contact lenses for various reasons. Many consider their appearance to be more attractive with contact lenses than with glasses. Contact lenses are less affected by wet weather, do not steam up, and provide a wider field of vision. They are more suitable for a number of sporting activities. Additionally, ophthalmological conditions such as keratoconus and aniseikonia may not be accurately corrected with glasses.
Related Stories
1
2
Health & Medicine News
April 8, 2026
Apr. 7, 2026 Researchers have developed a cutting-edge technique that uses RNA “barcodes” to map how neurons connect, capturing thousands of links with single-synapse precision. The method transforms brain ...
Apr. 7, 2026 Scientists at Cornell University may be closing in on the long-sought “holy grail” of male contraception: a safe, reversible, nonhormonal method that completely halts sperm production. In a ...
Apr. 7, 2026 Vitamin D levels in midlife may play a bigger role in long-term brain health than previously thought. In a study following nearly 800 people over 16 years, those with higher vitamin D levels in their 30s and 40s had lower levels of tau protein later ...
Apr. 7, 2026 Scientists at Oregon State University have captured something researchers have long struggled to see: the real-time chemical interactions that help drive Alzheimer’s disease. By watching how metal ions—especially copper—trigger harmful protein ...
Apr. 7, 2026 A gene called KLF5 may be a key force behind the spread of pancreatic cancer—but not in the way scientists expected. Rather than mutating DNA, it rewires how genes are turned on and off, helping tumors grow and invade new areas. Researchers found ...
Apr. 7, 2026 Scientists have finally uncovered the missing link in how our bodies absorb queuosine, a rare micronutrient crucial for brain health, memory, stress response, and cancer defense. For decades, ...
Apr. 7, 2026 A single week of intensive meditation and mind-body practices led to measurable changes across the brain and body. Researchers observed improved brain efficiency, boosted immune signaling, and increased natural pain relief chemicals in ...
Apr. 7, 2026 A surprising new study reveals that what you eat could play a powerful role in fighting cholera, a deadly diarrheal disease. Researchers found that diets rich in certain proteins—especially casein from dairy and wheat gluten—can dramatically ...
Apr. 6, 2026 Your brain’s “stop eating” signal may come from an unexpected source. Researchers found that astrocytes—once thought to just support neurons—actually play a key role in controlling appetite. After a meal, glucose triggers tanycytes, which ...
Apr. 6, 2026 Scientists have identified a little-known receptor, GPR133, as a powerful regulator of bone strength. By activating it with a newly discovered compound called AP503, they were able to boost bone density in mice and counteract osteoporosis-like ...
Apr. 6, 2026 Scientists have identified a potential new weapon against hepatitis E, a virus with no approved treatment and tens of thousands of deaths each year. The drug bemnifosbuvir, currently in trials for hepatitis C, was found to block the virus from ...
Apr. 5, 2026 Scientists in Canada have uncovered a surprising weakness in glioblastoma, one of the deadliest brain cancers. They found that certain brain cells—once believed to only support healthy nerves—can actually help tumors grow by sending signals that ...
Latest Headlines
updated 12:56 pm ET
Apr. 5, 2026 Scientists have uncovered a powerful new clue in the mystery of brain aging: a single protein called FTL1. In aging mice, higher levels of this protein weakened connections between brain cells and ...
Apr. 5, 2026 Scientists have created an artificial saliva using a sugarcane protein that can protect teeth and fight bacteria. The key ingredient, CANECPI-5, ...
Apr. 4, 2026 A new study reveals that gut bacteria and metabolites may hold the key to detecting serious digestive diseases earlier and more easily. Using AI, scientists found that biomarkers linked to one ...
Apr. 4, 2026 Many people think that occasional binge drinking is harmless if they otherwise drink in moderation, but new research suggests that assumption may be dangerously wrong. A large U.S. study found that ...
Apr. 4, 2026 Warming across the U.S. is far more uneven than it looks at first glance. While only about half of states show rising average temperatures, most are heating up in specific ways—like hotter highs or ...
Apr. 3, 2026 A new pill called baxdrostat is showing strong results in lowering dangerously high blood pressure in people who don’t respond to standard treatments. In a large global trial, patients saw their ...
Apr. 3, 2026 Scientists have created a programmable drug system that can zero in on cancer cells with unprecedented accuracy. Built from synthetic DNA, it only ...
Apr. 3, 2026 A new clinical trial suggests that what people eat could finally offer real relief for Crohn’s disease, a condition that has long lacked clear dietary guidance. Researchers found that a ...
Apr. 3, 2026 A new gene therapy is giving people born deaf the chance to hear, often within just weeks. In a small but groundbreaking study, researchers delivered a working copy of a key hearing gene directly ...
Apr. 3, 2026 A new study reveals that aging lungs may play a major role in why flu and COVID can become so dangerous for older adults. Researchers found that certain lung cells can trigger an exaggerated immune ...