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woman blocking eyes from sun

Can You Go Blind from Staring at the Sun?

A person cannot stare at the sun directly for long. It causes increasing discomfort, and for good reason: Looking at the sun is harmful to and dangerous for your eyes. Eye diseases like cataracts, photokeratitis, macular degeneration and eye-related cancers are all triggered by over exposure to the sun’s ultraviolet rays (UVR) and blue light. Staring […]

woman getting eye accommodation test

Eye Accommodation: How Our Eyes Focus

Eye accommodation is the natural process that allows you to keep your eyes focused on an object with excellent depth perception when that object — or you — are in motion. The process is made possile through a series of eye changes by its lenses. Our eyes lose their accommodation ability as we get older, […]

optical illusions

Optical Illusions: Types & What It Can Mean

When the brain receives signals from the eyes about an object or view that does not exist or that is distorted, it is called an optical illusion. The phenomenon points to an imperfection or malfunction in the vision system. Scientists have no hard explanation for these occurrences but suggest that evolution and physiology play a […]

cholesterol and your eyes

Cholesterol and Your Eyes

High cholesterol, a condition of excess lipid fat in the body, can create a range of negative eye conditions, some harmful, some not. Doctors suggest managing cholesterol levels by losing weight, eating healthier and exercising regularly. Cholesterol and Eyes Your body uses cholesterol, a waxy type of lipid fat, to manufacture vitamin D, steroid hormones […]

woman in sunglasses in the sun

UV Radiation, the Sun, and Your Eyes: Risks, Symptoms and Treatment

UV radiation is one of several types of powerful rays emitted by the sun. Although UV radiation is what delivers Vitamin D directly to the body, prolonged exposure to them causes skin cancer and a number of eye conditions. You should protect your eyes with wrap-around sunglasses and wide-brimmed hats. What Is UV Radiation? UV […]

lupus rash eyes

Lupus and Eye Issues: How Lupus Affects Your Eyes

Lupus is a chronic autoimmune disease that causes the immune system to attack healthy parts of the body, creating pain, inflammation and fatigue. Eyes are among the parts of the body that lupus can affect, causing issues of dry eye, scleritis, retinal vascular lesions, blood vessel changes in the retina and sometimes nerve damage. More […]

human eye close up

How the Eyes Work: Anatomy, Vision and More

Human eyes function when the three parts of the eye work together to let in light and focus the light to the retina, which sends electrical signals through the optic nerve to the brain. Eyes have three distinction sections — front, center and back. The front handles light input and focus. The center ensures the […]

driving at night

Night Vision Problems

Night vision problems are causes why someone cannot see clearly in low-light conditions. The most common reasons are age-related eye conditions, glaucoma, cataracts, presbyopia, diabetic retinopathy and complications for eye surgery, among others. Eye doctors can sometimes help someone see better at night by performing glaucoma surgery or cataract surgery and sometimes by refractive eye […]

woman in eyeglasses

What Is Considered Perfect Vision? How Common is Perfect Vision?

Visual acuity is what most people think of when considering how well your eyes function. The standard for measuring visual acuity is an eye chart test, which measures the clarity of vision at a distance of 20 feet.  20/20 vision is what eye doctors consider to be “good or normal” vision. Contrary to popular belief, […]

How Animals See the World

Have you ever looked at your pet and wondered what could be going on in their head? While we may not be able to read the minds of animals, as eyesight experts, we can use scientific studies and decades of research to reveal how various animals are seeing the world.  To do this, we reviewed […]

woman with hazel eyes

Brown Eyes vs. Hazel Eyes: What Is the Difference?

People often confuse hazel with brown eyes because of the nearly similar hues. Although rare, hazel eyes have the second-highest concentration of melanin, making them appear light brown in some environments.   Typically, hazel eyes take the color of a hazelnut — a mixture of green and brown. But color combinations of other shades like gold, […]

woman taking amsler grid eye test

Amsler Grid Eye Test: How to Use It and How It Works

The Amsler grid is a vision-testing tool with a square pattern (crossed vertical and horizontal lines that form squares). A dot in the middle of the grid serves as a focus point for those who take the test.   Anyone who suspects a change in vision can self-administer the test at home in coordination with […]