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A prescription of −1.00 +0.25 × 180 describes a lens that has a horizontal power of −1.00 D and a vertical power of −0.75 D. Only ophthalmologists write prescriptions in + cylinder. An optometrist would write a prescription in - (minus) cylinder. All spectacle and contact lenses would be made in minus cylinder.
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This feedback refines the prescription to one which provides the patient with the best vision. Automated refraction is particularly useful when dealing with non-communicative people such as young children or those with disabilities.
Man with glasses. A woman with glasses. Glasses, also known as eyeglasses, spectacles, or colloquially as specs, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.
The lens's minimum thickness can also be varied. The FDA ball drop test (5/8" 0.56-ounce steel ball dropped from 50 inches) [6] effectively sets the minimum thickness of materials. Glass or CR-39 requires 2.0 mm, but some newer materials only require 1.5 mm or even 1.0 mm minimum thickness.
A popular eyelash-enhancing drug's promotional materials are raising eyebrows among federal regulators. The U.S. Food and Drug Administration has warned Allergan (AGN) about what the agency says ...
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