Hemeralopia

Hemeralopia is a medical term that means "day blindness." This is a condition in which a person has difficulty seeing in bright light or daylight. Although hemeralopia can occur in varying degrees, in more severe cases people may only see silhouettes and may not be able to see details of the world around them.

Hemeralopia can be caused by a number of reasons, including genetic disorders, infections, injuries, and certain medications. For example, hemeralopia may be a symptom of a lack of vitamin A, which plays an important role in eye health. Hemeralopia can also be caused by certain diseases, such as retinopathy, diabetic retinopathy or glaucoma.

Symptoms of hemeralopia may include blurred vision, difficulty reading, or difficulty seeing in bright lights. People with hemeralopia may have difficulty performing common daytime tasks, such as driving a car or reading street signs.

Treatment for hemeralopia depends on its cause. If hemeralopia is caused by a lack of vitamin A, treatment may include taking additional vitamins. Conditions such as retinopathy or glaucoma may require surgery or medication.

Overall, hemeralopia is a serious condition that can significantly limit a person's life. If you have difficulty seeing in bright light, see your doctor for a diagnosis to determine the cause of your vision problem. Seeing a doctor early can help prevent vision deterioration and maintain quality of life.

Hemeralic, or day blindness (English name: Hemeralopia), is a form of acquired visual perception disorder without pathology of the brain or retina, detected only during daylight hours\[1]. The extreme form is accompanied by strabismus, and in case of disease of the temporal part of the eye, it is also accompanied by severe sensorineural hearing loss. This type of vision is usually observed after severe infectious diseases, general intoxication of the body, brain injuries, with general metabolic disorders and taking large doses of alcohol and sedatives.

Hemeralic type of vision is characterized by a decrease in the sensitivity of photoreceptors to daylight, the appearance of hypoesthesia - increased sensitivity of light perception at night, and blindness during the daytime. A person’s ability to see objects in the shadow depends on the severity of the disorder. In a brightly lit environment, due to lack of adaptation to light, a person is not able to see objects that resemble a disk in shape.

During the day, the patient becomes blind, since light is an “insurmountable obstacle” for him and for the normal functioning of his eyes, the person is forced to squint or close them, which often leads to the development of strabismus. Swelling of the iris and pupil occurs, and the light sensitivity of the eyes is significantly reduced. In clinical practice, it has been revealed that in the refractive system there is a presence of a yellow-brown substance that abundantly fills the lens and vitreous body. The causes of day blindness are due to complex metabolic changes within the body due to dysregulation of the functions of neurosecretory cells of the posterior pituitary gland. During the examination, the special functional activity of one part of the brain (the cones of the visual thalamus) is revealed, which is necessary for the regulation of the circadian rhythm