Why can you see clearly when wearing someone's glasses when you have perfect vision?

When you wear someone else's glasses, you may see clearly despite having perfect vision because the prescription may not distort your sight significantly. If the lenses are not too strong or weak compared to your vision, they can still provide a relatively clear image. Additionally, your brain can adapt to minor visual discrepancies, allowing you to focus better with the glasses on. However, wearing lenses that are significantly different from your prescription may cause discomfort or blurred vision.