Which of the following is a common sign of optic neuritis?

Central scotoma is a common sign of optic neuritis. This condition typically involves inflammation of the optic nerve, leading to symptoms such as visual field defects and loss of vision, which often manifest as a central scotoma. A central scotoma appears as a dark or blurry spot in the center of one’s vision while peripheral vision may remain intact. This symptom arises due to the damage to the retinal fibers that transmit visual information.

The inflammation in optic neuritis often leads to the demyelination of nerve fibers, contributing to the loss of central vision. This phenomenon is particularly notable in conditions like multiple sclerosis, which frequently presents with optic neuritis as an early sign.

Increased pupillary light reaction, halos around lights, and loss of color perception in the unaffected eye are not characteristic signs of optic neuritis. Typically, with optic neuritis, patients may experience diminished pupillary light reflex in the affected eye due to the optic nerve involvement. Halos around lights can be associated with conditions such as glaucoma or cataracts, while loss of color perception is generally more pronounced in the affected eye than in the unaffected eye.