Love is blind

The other day, I saw an auxiliary sticker on a vial of Viagra.

Please note that, while the sticker I read did reside on a vial of Viagra, it was not my vial of Viagra.

The sticker was a warning about using Viagra and it read as follows:

Report any sudden loss of vision to your doctor immediately.

Are there people out there who actually need this advice?

Are they having sex and going blind, and then choosing not to immediately contact a doctor?

If so, let's hope they aren't having sex to reproduce.