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2. Magnifying glass - Wikipedia

   en.wikipedia.org/wiki/Magnifying_glass

   Magnifying glass on an arm lamp. The magnification of a magnifying glass depends upon where it is placed between the user's eye and the object being viewed, and the total distance between them. The magnifying power is equivalent to angular magnification (this should not be confused with optical power, which is a different

3. Stanhope lens - Wikipedia

   en.wikipedia.org/wiki/Stanhope_lens

   René Dagron modified the lens by keeping one curved end to refract light while sectioning the other end flat and locating it at the focal plane of the curved side. [3] Dagron used the modified Stanhope lens in mounting his microscopic pictures in photographic jewels known as Stanhopes. A rival lens is the Coddington magnifier. This was ...

4. Royal National Institute of Blind People - Wikipedia

   en.wikipedia.org/wiki/Royal_National_Institute...

   RNIB's helpline gives access to sight loss experts for questions and guidance. [25]RNIB's extensive range of reading services includes RNIB Bookshare – a free library of over one million items, which supports students and others in education with a vast collection of accessible textbooks and materials [26] – and Talking Books, a service first established in 1935, [27] which offers ...

5. Magnification - Wikipedia

   en.wikipedia.org/wiki/Magnification

   The postage stamp appears larger with the use of a magnifying glass. Stepwise magnification by 6% per frame into a 39-megapixel image. In the final frame, at about 170x, an image of a bystander is seen reflected in the man's cornea. Magnification is the process of enlarging the apparent size, not physical size, of something.

6. Frenzel goggles - Wikipedia

   en.wikipedia.org/wiki/Frenzel_goggles

   This is done by using high-powered (+20 diopters) magnifying glasses with an illumination system. With such a high-powered lens, it is unlikely that the patient can adequately focus and visually fixate on an object to suppress nystagmus. [2]

7. Coddington magnifier - Wikipedia

   en.wikipedia.org/wiki/Coddington_magnifier

   A Coddington magnifier is a magnifying glass consisting of a single very thick lens with a central deep groove diaphragm at the equator, thus limiting the rays to those close to the axis, which minimizes spherical aberration. This allows for greater magnification than a conventional magnifying glass, typically 10× up to 20×. Most single lens ...