Eyesight is delicate: natural is not always synonymous with safe, especially when it comes to the eye.
What the evidence says: between myth and caution
Some studies have evaluated guava compounds for their antioxidant or antimicrobial properties in the laboratory. That sounds interesting, but it doesn’t mean that a leaf placed on the eyelid or a homemade preparation will improve vision. In research, observing a substance under controlled conditions is one thing, but using it on a sensitive human eye is quite another.
Furthermore, health organizations and ophthalmologists often emphasize a basic principle: any substance that is not an eye product specifically formulated for that purpose should be used with extreme caution. The eye does not tolerate improvisation well. And that is the part that many advertisements omit.
Warning signs that require medical attention
If blurred vision is accompanied by any of these symptoms, it is not advisable to wait to see if it “goes away on its own”:
