Cyanopsia is a medical term for seeing everything tinted with blue. It is also referred to as blue vision. Cyanopsia often occurs for a few days, weeks, or months after removal of a cataract from the eye. Cyanopsia also sometimes occurs as a side effect of taking sildenafil, tadalafil, or vardenafil.

Does Cyanopsia go away?

While it's known that sildenafil can cause temporary vision changes, including blurred vision and cyanopsia, these side effects typically disappear within 3 to 5 hours.

Why does viagra make you see blue?

One possibility for the blue vision could be that a small number of the population is unable to break sildenafil down and eliminate it from their body efficiently. This would lead to high concentrations of the drug in the bloodstream compared to other users and hence, the blue-tinted vision.