Both refractive errors require corrective lenses in order to cure blurriness of vision.

Cinematography requires simpler, but technically superior, spherical lenses.

This is more nearsighted than -1.00, and requires stronger (thicker) lenses.

What all this means is that because the larger formats require longer lenses than the smaller ones, they will accordingly have a smaller depth of field.

Because they must project the reflected light, opaque projectors require brighter bulbs and larger lenses than overhead projectors.

If you're a veteran shutterbug with a case full of lenses, these new models may not be for you; both generally require all-new proprietary lenses.

He requires corrective lenses and may be wearing eyeglasses.

One may require corrective lenses and the others not, or need different prescriptions.

The disadvantage is that their viewing telescopes would require huge lenses and mirrors, much larger that those on today's low-orbiting spy satellites.

Before gaining his abilities Peter Parker required corrective lenses to see properly.