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視力 is individual ability of eyesingt how you can see small or far objects.

You can check it by the eye-sight test chart.視力 could be improved by eyeglasses.

視覚　is one of five senses, touch/taste/hearing/eyesingt/smell.

視覚　is not only the ability of eyes, but it could include ability that you brains recognaize what your eyes catch. 視覚　is more achademic term. 視力 is more day-to-day word.

-when did you dye your hair blonde?

いつ髪の毛をブロンドに染めたの？

does it fade quickly?

すぐに色あせたりしない？

- i like your hair

あなたの髪の毛、すてきです。

-that's a nice lip piercing

そのクチビルのピアス、いいですね。