Definitions

1. noun

A chemical compound that emits light when an electric current is passed through it, especially a gas or vapour that produces a glowing effect when excited by an electric discharge.

“The neon sign in the store window was a phosphene that attracted the attention of passers-by.”

2. noun

A visual sensation, especially a flash of light, produced by a chemical or electrical reaction in the eye, often resulting from a blow to the head or a seizure.

“The patient’s eyes were sensitive to light after the concussion, and she experienced a phosphene that made her see a flash of bright light.”