I use a microscope for biology experiments.

He was observing the distant birds with binoculars.

He was observing a three-dimensional image using a stereoscope.

He took a photo using a fisheye lens.

My eye pain is so severe that it's hard for me to look at the computer screen.

I saw a Japanese white-eye in the park.

I put eyedrops in every day.

Since she is studying fine arts, her eyes that are able to recognize beauty are being trained.

If the movement of the ocular muscle becomes impaired, your vision will become blurry.

He terrified people with that evil eye.