Otherwise known as Nyctalopia, night blindness refers to the eye’s difficulty to see images at night, or in dimly lit environments. This has no effect on one’s vision during day time. So what are night blindness symptoms and causes?
The Eyes of Someone with Night Blindness
The principal cell associated with this condition are rod cells, which are photoreceptor cells located in the retina. These take incoming visual stimuli in the form of photons, and transform them into electrical signals. These then travel through the optic nerve and to the brain.
Night blindness symptoms and causes point to the fact that Nyctalopia is a specific type of vision impairment, and is regarded by some medical professionals as a symptom of an underlying issue, instead of a condition in itself.
It is observed that in dimly lit environments or at night time, your eyes constantly adjust to levels of light, depending on the surrounding environment and the object being focused on. In order to capture more light, your pupils dilate or enlarge. This light is then received and processed by the retina, which is located at the back of the eye. The retina is the home of the rod and cone cells, which are responsible for helping the eyes process colors and find clarity in the dark. When the rod cells are not functioning properly, as a result of an injury, condition, disease, or for some other reason, night blindness is the result.