https://en.wikipedia.org/wiki/Spasm_of_accommodation https://en.wikipedia.org/wiki/Spasm_of_accommodation > a condition in which the ciliary muscle of the eye

https://en.wikipedia.org/wiki/Spasm_of_accommodation https://en.wikipedia.org/wiki/Spasm_of_accommodation > a condition in which the ciliary muscle of the eye remains in a constant state of contraction. Normal accommodation allows the eye to "accommodate" for near-vision. However, in a state of perpetual contraction, the ciliary muscle cannot relax when viewing distant objects. This causes vision to blur when attempting to view objects from a distance. This may cause pseudomyopia or latent hyperopia. Relatedly, "dark mode" causes pupil dilation and loss of focus. Best to match screen and ambient lighting.