Explanation:
Although the UV spectrum starts at about 400 nanometers, the skin is more severely harmed by lower wavelengths (below 320 nm). Fortunately, the Earth's atmosphere largely absorbs wavelengths shorter than 290 nm.
Explanation:
The lenticular lens, now uncommon, was frequently used to aphakic patients (without natural crystalline lens or implanted IOLs). Although it had a strange appearance, it succeeded in being lighter than a full-field +16.00 lens would have been.
Explanation:
The ability to bend a coherent beam of light by 1 centimeter at a distance of 1 meter from the lens is known as the diopter, which serves as the fundamental unit of measurement for refractive power.
Explanation:
Vertex distance is a measurement of how far a corrective lens is placed from the eye, and if it differs from the distance the doctor used during the eye exam, it may have an impact on the patient's effective power of correction.
Explanation:
A plus-power lens is designed such that light rays travelling through it will converge into a single point.
Explanation:
The reciprocal of dioptric power is focal length, measured in meters. The conversion equation in this instance would be 1 divided by 0.4 meters, or 2.5. The lens must be a plus lens since its focal length can be measured.
Explanation:
Whether a patient is myopic or hyperopic is determined by the prescription's sphere power. Negative numbers signify myopia. In contrast, positive values denote hyperopia.
