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2. Dome magnifier - Wikipedia

   en.wikipedia.org/wiki/Dome_magnifier

   A dome magnifier is a dome-shaped magnifying device made of glass or acrylic plastic, used to enlarge words on a page or computer screen. They are plano-convex lenses : the flat (planar) surface is placed on the object to be magnified, and the convex (dome) surface provides the enlargement.

3. Presbyopia - Wikipedia

   en.wikipedia.org/wiki/Presbyopia

   A common sign of presbyopia is difficulty in reading small print, which results in having to hold reading material farther away. Other symptoms associated can be headaches and eyestrain. [4] Different people experience different degrees of problems. [1] Other types of refractive errors may exist at the same time as presbyopia. [1]

4. Magnifying glass - Wikipedia

   en.wikipedia.org/wiki/Magnifying_glass

   A pen seen through a magnifying glass Jim Hutton as detective Ellery Queen, posing with a magnifying glass. A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. Beyond its primary function of magnification, this simple yet ingenious tool serves a ...

5. Magnification - Wikipedia

   en.wikipedia.org/wiki/Magnification

   The maximum angular magnification (compared to the naked eye) of a magnifying glass depends on how the glass and the object are held, relative to the eye. If the lens is held at a distance from the object such that its front focal point is on the object being viewed, the relaxed eye (focused to infinity) can view the image with angular ...

6. Category:Screen magnifiers - Wikipedia

   en.wikipedia.org/wiki/Category:Screen_magnifiers

   Print/export Download as PDF; Printable version; ... Virtual Magnifying Glass; Z. ZoomText This page was last edited on 26 November 2023, at 14:20 ...

7. Reading stone - Wikipedia

   en.wikipedia.org/wiki/Reading_stone

   The invention of reading stones is often credited to Abbas ibn Firnas in the 9th century, [1] although the regular use of reading stones only began around 1000 AD. [ 2 ] [ 3 ] Early reading stones were manufactured from rock crystal (quartz) or beryl as well as glass, which could be shaped and polished into stones used for viewing.