What Causes Night Blindness (Nyctalopia)?

Myopia

Myopia, more commonly known as nearsightedness, is a condition that causes individuals to have trouble seeing faraway objects. When the object is closer to their face, they can make out the details more clearly. Myopia is caused by changes in the structure of the eye. When the cornea is abnormally curved or the eyeball abnormally lengthened, light focuses in front of the retina instead of on it. This means patients don't receive image data from far away objects, even though their eyes can still focus on close objects. Myopia is one of the most common eye conditions and tends to run in families. It can often be corrected with glasses, photorefractive keratectomy surgery, or LASIK surgery. Some patients may find their myopia is worse at night, leading to symptoms of night blindness. It might be difficult to drive in dim light or make out road signs until they're extremely close.