I stretch out a clean palm. Every single line on my fingers is clear. I cup my hand and pour droplets of water. A thin disc of polymer is immersed in the water.
I use my fingers to pick it up and place this small disc on my eyeball. The round surface shines with the water that just moistened it. And my eye shines with the power of vision.
Small things often make a huge difference - that we do not notice.
The difference is just more 'noticeable' for a person when that small thing is called a contact lens.