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Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria. Cause. Causes include: Refractive errors; Divergence insufficiency; Convergence excess; this can be due to nerve, muscle, congenital or mechanical anomalies.
Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
Incomitant strabismus cannot be fully corrected by prism glasses, because the eyes would require different degrees of prismatic correction dependent on the direction of the gaze. Incomitant strabismus of the eso- or exo-type are classified as "alphabet patterns": they are denoted as A- or V- or more rarely λ -, Y- or X-pattern depending on the ...
MSRP. US$400 USD. The Canon EF-S 60mm f/2.8 Macro USM lens is Canon's first EF-S ( APS-C sensor-specific) macro lens, and also the company's first prime lens made specifically for the EF-S mount. Introduced in 2005, it was the only EF-S prime lens until the announcement of the EF-S 24mm f/2.8 STM in September 2014; a second EF-S macro lens, the ...
10°35'. Diagonal. 18°40'. Retail info. MSRP. $1400 (Street: $900) USD. The MP-E65mm f/2.8 1-5x Macro Photo is a photographic lens that was released in September 1999 and was discontinued in 2023. It was manufactured by Canon for use on the EOS photographic system. It is a manual focus lens for the EF mount and is specifically designed for ...
The Micro Four Thirds system cameras and lenses perform automatic distortion correction using correction parameters that are stored in each lens's firmware, and are applied automatically by the camera and raw converter software. The optics of most of these lenses feature substantially more distortion than their counterparts in systems that do ...
The EF 35mm f/2 is a prosumer level lens. It is constructed with a plastic body and a metal mount. This lens features a distance window with infrared index. The maximum aperture of f/ 2 gives this lens the ability to create depth of field effects, but not to the same shallowness of the EF 35mm f/ 1.4L USM, while its five-blade diaphragm may ...
Prism (optics) An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.