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Nyctalopia is a condition known as night blindness. People with this condition have difficulty seeing in low light or adjusting their vision when moving from a brightly lit area to a dark area. It is not complete blindness at night, but a severe impairment of vision in dim settings.
read more about nyctalopia ...The condition is caused by a malfunction of the rod cells in the retina. Rod cells are responsible for vision in low light. Damage or degeneration of these cells or the surrounding tissue impairs the ability to adapt to darkness.
Symptoms include poor visual clarity in dim light, difficulty recognizing faces or obstacles in the dark, and slow adjustment when the lights are turned off. Nyctalopia is often one of the earliest signs of inherited retinal diseases like retinitis pigmentosa.
Eye doctors diagnose nyctalopia through a full exam, which may include electroretinography (ERG) to measure the rod cells' response to light. Treatment depends on the cause. Vitamin A supplements can cure deficiency-related cases. For inherited conditions, management involves treatment of the underlying disorder.
The pupil attempts to compensate for nyctalopia by dilating widely to let in more light. However, if the rod cells are damaged, more light cannot correct the vision. Large pupils can also introduce optical aberrations, which sometimes makes low light vision even worse.
No, glasses cannot fix nyctalopia because the problem lies with the retina's ability to sense light, not the eye's focusing power.
While some age-related conditions contribute, nyctalopia itself is often genetic or related to nutrition.
No, the inability to see well in low-light conditions makes driving at night unsafe.
If you struggle to see in dim restaurants or find it impossible to navigate your home at night, consult a doctor. This can be a sign of Vitamin A deficiency or an inherited retinal condition like Retinitis Pigmentosa (RP) that needs genetic counseling.
AAO. What is Night Blindness? (aao.org). 2024.
NEI. Retinitis Pigmentosa (nei.nih.gov). 2023.
Mayo Clinic. Vitamin A Deficiency (mayoclinic.org). 2024.
Cleveland Clinic. Nyctalopia: Night Blindness (clevelandclinic.org). 2024.