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Different designs of progressive lenses have more or less of this distortion. Fitting: Progressive lenses require careful placement relative to the wearer's pupil centre for a distance-viewing reference position. Incorrect specification of the fitting location can cause problems for the wearer including (depending on the design of the lens ...
The design of a fixed focal length lens (also known as prime lenses) presents fewer challenges than the design of a zoom lens. A high-quality prime lens whose focal length is about equal to the diameter of the film frame or sensor may be constructed from as few as four separate lens elements, often as pairs on either side of the aperture diaphragm.
As new technologies and manufacturing processes were being developed, the research efforts concerning Varilux continued. In 1988, the result came with Varilux Multi-Design, or VMD. [11] The Multi-Design concept was a first stage of personalization of the progressive lens, a specific optimum design for each age class of the presbyopic wearer. [12]
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The Paul G. Allen Family Foundation, which he founded with his sister Jody, was established to administer a portion of Allen's philanthropic contributions. Since its formation, the foundation has given more than $494 million to over 1,500 nonprofits; and, [ 112 ] in 2010, Allen became a signatory of The Giving Pledge , promising to give at ...
Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi-focal lenses. Additionally, the ideal near-vision correction can be achieved with precision, because the variable lenses emulate the focusing action of the youthful (non-presbyopic) eye.
Retrofocus lenses are extremely asymmetric with their large front elements and therefore very difficult to correct for distortion by traditional means. On the upside, the large negative element also limits the oblique cos 4 θ light falloff of regular wide-angle lenses. [59] [60] [61] Retrofocus design also influenced non-retrofocus lenses.
Different kinds of camera lenses, including wide angle, telephoto and speciality. A camera lens, photographic lens or photographic objective is an optical lens or assembly of lenses (compound lens) used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.
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