A person who is completely blind will be unable to see anything. A person with limited vision, on the other hand, may be able to perceive not just light, but also colors and forms. They may, however, have difficulty reading street signs, identifying people, or matching colors. If you have poor vision, your vision may be foggy or confused. You should talk with your doctor about what options are right for you.
Blindness is usually caused by an eye disease called macular degeneration. This is the most common cause of blindness in older people. It results in the death of cells in the center of the retina that are responsible for sight. The damage is done mostly past age 50; however, if you have a family history of macular degeneration, you may want to get checked out to see if you have the genes that lead to this disease.
Another cause of blindness is called optic neuritis. This happens when the optic nerve is damaged, resulting in loss of vision in both eyes. Optic neuritis can be caused by multiple sclerosis, which affects the brain and spinal cord. Or it can be caused by something else, such as a virus or stroke. In this case, vision will return to normal after the nerve has had time to recover.
Last, but not least, blindness can be caused by conditions such as glaucoma or cataracts. If you have any of these problems being treated by a doctor, make sure they know about it.
People who are going blind frequently have vision impairment first, followed by blindness. Blindness can damage one or both eyes and does not always result in utter darkness. Many persons who are classified as blind can sense some light or shadows but cannot see anything clearly. The world around them becomes distorted and looks strange.
The most common cause of blindness is age-related macular degeneration (AMD). This is a disease of the central part of the retina called the macula that causes loss of sight in its early stages. Late diagnosis leads to late treatment, which can lead to severe visual impairment or blindness. Other reasons for becoming blind include diabetes, glaucoma, AIDS, and various infections.
People who are blind require assistance with daily living activities such as eating, dressing, cleaning, writing letters, using public transportation, paying bills, and using the phone. Some form of aid is always required to communicate with others, including reading glasses or contact lenses for far vision and a white cane for near vision.
People who are going blind may use their other senses to compensate for their lost vision. They might read braille or listen to recordings to learn about what is happening around them. Some people who are blind become visually oriented transporters, guiding others through cities and towns with the help of maps and tactile sensations.
Visual impairment is a phrase used by professionals to describe any type of vision loss, whether the person cannot see at all or has partial vision loss. Some people are absolutely blind, but many others suffer from what is known as "legal blindness." The term "visual impairment" includes both eyes being affected by disease or injury and one eye being affected by disease or injury while the other eye is healthy. Visual impairment can also be caused by conditions such as cataracts or glaucoma. People who are visual impaired need assistance with tasks that require sight, like reading street signs or using public transportation.
People become visually impaired due to diseases and illnesses that affect the eye itself or those that impact its surrounding area. Some examples include diabetic retinopathy, macular degeneration, glaucoma, and age-related macular degeneration. Other causes include injuries to the eye, such as from a car accident or a work-related incident; disorders related to the brain, such as stroke or tumor; and congenital defects, such as microphthalmia or anophthalmia.
People become legally blind if they cannot see clearly enough to perform everyday tasks without assistance. This may be because of irreversible damage done to the retina by diabetes or other diseases. Many people who are diagnosed with diabetes develop retinopathy, which is damage to the retina due to high blood sugar levels.
Most colorblind persons can see things as clearly as others, but they cannot completely "see" red, green, or blue light. There are several forms of color blindness, and in rare situations, people are unable to perceive any color at all.
Color vision is based on the sensitivity of the human eye to different wavelengths of light. The three types of color blindness are: red-green, blue-yellow, and black-white. These conditions affect how individuals perceive colors; they do not destroy your sense of sight entirely.
People who are color blind cannot distinguish between certain colors, usually because they are missing one of the cone cells in the retina. The two types of color blindness that most affect vision are red-green and blue-yellow. In these cases, individuals are unable to distinguish between red and green lights or blue and yellow ones. They may see white lights as both red and green, which is why these individuals need to be informed about the colors used in warnings etc. A person who is color blind could also miss an accident scene that involved cars of different colors.
In some cases, color blindness is due to problems with other parts of the eye, such as the lens or the nerve endings behind the lens. This type of color blindness is called anomalous color perception.
According to the American Foundation for the Blind, most persons who are actually legally blind have some vision, unlike those who are totally blind, which means they can't see anything out of either eye. People who are legally blind may have 20/200 vision in one eye and 20/400 vision in the other eye. This means they would need to be able to see objects that are at least 200 feet away or farther in the better eye to avoid being considered totally blind.
The majority of people who are visually impaired because of illness or injury use visual devices to help them see. The types of visual devices used include glasses or contacts with lenses to correct refractive errors such as myopia (nearsightedness) or hypermetropia (farsightedness), telescopes, light-emitting diodes (LEDs) devices, and robotic eyes. Some individuals who are completely blind use auditory cues to navigate their environment.
People who are legally blind can generally see shapes, colors, lights, and details of everyday objects using their remaining vision. They may require some assistance from others to complete daily tasks such as driving a car or reading street signs. Most blind people rely on hearing voices or feeling objects with their hands to become aware of their surroundings.