Day Blindness

Day blindness is a condition in which a person sees well in low light conditions, but has trouble seeing objects in bright light. This relatively rare disease is usually congenital and is accompanied by decreased visual acuity and impaired color perception.

The cause of day blindness is underdevelopment or damage to the cone apparatus of the retina, which is responsible for the perception of color and works mainly in bright light. In the dark, vision is provided by the rod apparatus of the retina, which is usually not affected by this disease.

Day blindness can also occur as an acquired condition. In this case, the cones of the retina are destroyed as a result of some disease or injury.

The medical name for day blindness is hemeralopia. The opposite condition is nyctalopia, or “night blindness,” where a person has difficulty seeing in low light.

Day blindness - Day Blindness > Hemeralopia (ancient Greek γημος - “shadow” + ἄλωσις - “destruction”) is a congenital or acquired disease of the organ of vision caused by a pathological change in the visual pigment - rhodopsin, in rods (and not in cones, as this occurs during night vision) or cones, which is why they stop producing and receiving light impulses. Clinically manifested by decreased vision “in bright daylight.”[1][2] > The disease is associated with impaired vision at night: despite complete darkness, after watching TV, patients are able to read their own name on an open window. Scientists have proven that the degree of hemeralapia is directly related to the time of day. If during the day all color-sensing areas of the retina can suffer, then at night only those that generate primary colors are visible. The disease is often transmitted genetically. A person even distinguishes nearby objects, but ceases to see into the distance or attention floats[3].

Day vision blindness or day blindness is a disorder that occurs in a person without a change in the level of illumination, in which he is unable to perceive objects and images normally in light conditions.

We have all encountered a similar condition when working at a computer monitor for a long time. The person gets very tired, his eyes begin to hurt and turn red. He begins to see worse and achieve less, and makes mistakes in his work or important information. There are also studies showing that this condition often occurs during prolonged work related to numbers, for example, when you have to peer a lot into tables with numbers and graphs. Moreover, in children with low intelligence (those who do not cope well with complex tasks) this condition occurs more often than in more intelligent and educated schoolchildren. It is not clear why this happens. It is assumed that children simply do not pay enough attention to visual hygiene, or that their visual system is not as perfect as that of other children. How can this be fixed? __Always force your child to look at objects up close (about a meter or more from the eyes) rather than at a TV or computer screen.__ If you pause briefly while working or playing, give your child a rest. Then again force him to look at an object no further than 25 cm or at an open area of ​​​​the body. The flickering frequencies of sedentary electronic devices for the prevention of hemeragic cataracts will have to be avoided, but their use is necessary if it is necessary to cope with a large amount of information in this state. Just choose not flicker, but a frequency of about 240 Hz.

Day blindness is often associated with disorders of the retina caused by its gradual age-related degeneration. This disease is congenital, although it can fully manifest itself only after 30 years. The perception of brightness and saturation of colors, especially daylight, is impaired, which is also manifested by a decrease in the overall quality of vision. For diagnosis and treatment, the doctor selects individual therapy.