What does quinine water do to your eyesight?

Quinine water, which contains quinine, is primarily used as a tonic and has been associated with various effects on the body, including potential impacts on eyesight. High doses of quinine can lead to visual disturbances, such as blurred vision or changes in color perception, due to its effects on the retina and optic nerve. However, the amounts found in tonic water are typically too low to cause these adverse effects. It's always advisable to consult a healthcare professional if you experience any vision issues.