What type of vision issue is twilight myopia related to?

Twilight myopia is specifically associated with a myopic shift that occurs in low light conditions. This phenomenon occurs when an individual's visual system experiences difficulty focusing on distant objects as lighting diminishes, often leading to blurred vision for these objects. In low light environments, the eye's ability to adjust may result in a situation where the focal point shifts, thereby creating a temporary nearsighted state.

This effect is believed to be influenced by the human eye's changing response to light levels, where the pupils dilate and the depth of field decreases, causing an increase in the perception of blurriness at distance. Twilight myopia can be especially pronounced in individuals with existing myopia, but it can also affect those with normal vision temporarily. Understanding this condition helps in recognizing how lighting can alter visual acuity and informs practices for activities conducted in varying light environments.