Final answer:
Most illegal drugs, including hallucinogens, stimulants, and cannabis, can affect vision, but without a list of specific drugs, we cannot identify what does not. The effects on vision can range from blurred vision to altered color perception. Drug use carries unpredictable and harmful health effects.
Step-by-step explanation:
The effects of illegal drugs can vary widely and encompass a range of physical and sensory impacts, including effects on vision. Typically, drugs such as hallucinogens (like LSD), stimulants (like cocaine), and cannabis can alter a user's vision, either through effects such as blurred vision, changes in light sensitivity, or altered color perception. However, without a list of specific drugs to choose from in the question, we cannot definitively say which drugs do not affect vision. With that said, it is important to remember that drug use, especially illegal drug use, can have many unpredictable and harmful effects on one's health, beyond just vision.