Fildena CT 50, which contains sildenafil citrate, is primarily used to treat erectile dysfunction by increasing blood flow. However, like all medications, it can have side effects. Some users have reported temporary visual disturbances such as blurred vision, increased sensitivity to light, or a blue tint in vision. These effects are usually mild and subside as the drug wears off. In very rare cases, sildenafil has been associated with more serious vision problems such as non-arteritic anterior ischemic optic neuropathy (NAION), which could potentially cause permanent vision loss. Individuals with pre-existing eye conditions or risk factors should consult a doctor before use.