Colorblindness, also called color vision deficiency, is an inherited condition that can range from a slight difficulty in telling the shades of a color apart to the rare condition of not being able to identify any color.
The most common type of colorblindness is one in which the person can't distinguish between red and green. The second most common type is the inability to distinguish between blue and yellow.
The dazzling visual experience of color begins when light strikes nerve cells in the retina at the back of the eye. These cells are called rods and cones. Rods help us distinguish light and dark; cones contain chemicals that identify color and send the message to the brain that enables us to see color. People who are colorblind are lacking in one or more of the chemicals contained in the cone.Know the Signs, Symptoms and Causes of Color Blindness ›
If you suffer a serious eye injury, what you don't do immediately afterward may help more than what you do.
The main error of first aid to the eye is poking around when you don't know what you're doing. There's very little that an inexperienced person can do without causing trouble -except in the case of a chemical burn.
For any eye injury, a knowledgeable approach can mean the difference between temporary or permanent injury.
A cut on the eye is not uncommon among workers who strike metal on metal, or otherwise work with fast-moving particles - and who neglect to wear safety glasses or other appropriate eye protection. You can get such an injury just by using a lawn trimmer or by running into a sharp twig.How to Respond to an Eye Emergency ›
Prevention of Eye and Vision Disorders
The sports that cause most of the 40,000 sports-related injuries each year are basketball, baseball, pool sports and racket sports. But any sport that involves a projectile is considered hazardous to the eyes, according to the American Optometric Association (AOA). Protective Eyewear Keeps Kids in the Game ›
Prepare for Your Appointment
With just 13 minutes on average to meet with your doctor, pre-visit planning is important to your overall care experience. Get better results by following the ABCs of doctor visits: Arrive early. Be prepared. Communicate. Your doctor appreciates the active role you are taking in your health. Search HealthGrades for Top Rated Local Eye Doctors, Ophthalmologists and Optometrists ›
Decision Guides for Symptoms Concerning the Eyes and Vision
This information cannot replace a face-to-face evaluation with your own health care provider. It is meant to provide helpful information while you are awaiting further evaluation or to supplement what you may have already learned after evaluation with your doctors. Begin Evaluating Your Vision Problems ›