The notation 10×42 on binoculars indicates the magnification power and the objective lens diameter. Specifically, ’10x’ denotes a ten-times magnification of the image, while ’42’ represents a 42mm aperture size for light collection.
D.S. on an eye prescription indicates the distance portion of the lens power, detailing spherical, cylindrical, and axis values for correcting far‑vision. It is commonly used in multifocal prescriptions and varies by region.
The designation ’10×42′ on binoculars indicates a magnification of 10 times and an objective lens diameter of 42 millimeters. This standard notation helps users understand the device’s optical power, light-gathering ability, and suitability for various activities like birdwatching, hunting, and astronomy.
In an eyeglass prescription, ‘Add’ refers to the additional magnifying power required for near-vision correction. It is typically prescribed for individuals with presbyopia to assist with reading and close-up tasks.
The term ‘Add 2.25’ on an eye prescription refers to the additional lens power needed for near vision, commonly used in multifocal or bifocal lenses. It indicates a +2.25 diopter addition to the distance prescription to aid with presbyopia, a condition affecting close-up focusing.
15/20 vision is a measure of visual acuity that indicates the clarity or sharpness of vision relative to standard eyesight. It means that what a person with normal vision can see clearly at 20 feet, a person with 15/20 vision can see clearly at 15 feet.
In the context of contact lenses and optometry, ‘plano’ refers to a lens with no corrective power. A plano lens does not magnify or diminish an image, meaning it is functionally neutral in terms of vision correction.
The notation +4.5 is primarily used in sports betting to indicate a point spread advantage for an underdog. It is also utilized in optometry to denote lens prescription strength for hyperopia.
Pd 60/57 is a notation commonly used in eyeglass prescriptions to indicate the pupillary distance (PD) for distance vision (60 mm) and near vision (57 mm). This measurement ensures that lenses are aligned correctly with the wearer’s pupils for optimal visual clarity.
Plano on an eye prescription indicates a lens power of zero diopters, meaning no corrective power is required for that eye. It is commonly used for patients with normal vision or for the non‑dominant eye in certain contact lens prescriptions.