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2. Belay glasses - Wikipedia

   en.wikipedia.org/wiki/Belay_glasses

   Principle of operation of belay glasses. Light from above is reflected into the observer's eye. Belaying involves a person standing on a stable platform below a rock climber controlling the tension and friction of the climber's rope.

3. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.

4. Louvre Pyramid - Wikipedia

   en.wikipedia.org/wiki/Louvre_Pyramid

   The Louvre Pyramid (French: Pyramide du Louvre) is a large glass-and-metal structure designed by the Chinese-American architect I. M. Pei.The pyramid is in the main courtyard (Cour Napoléon) of the Louvre Palace in Paris, surrounded by three smaller pyramids.

5. Prism (optics) - Wikipedia

   en.wikipedia.org/wiki/Prism_(optics)

   Prism spectacles with a single prism perform a relative displacement of the two eyes, thereby correcting eso-, exo, hyper- or hypotropia. In contrast, spectacles with prisms of equal power for both eyes, called yoked prisms (also: conjugate prisms, ambient lenses or performance glasses) shift the visual field of both eyes to the same extent. [5]

6. Progressive lens - Wikipedia

   en.wikipedia.org/wiki/Progressive_lens

   Compared to single vision lenses, progressive lenses provide the correction required for a presbyopic patient to see clearly at all viewing distances, typically adjusted by tilting the head slightly — or else by moving the object that is being viewed.

7. Worth 4 dot test - Wikipedia

   en.wikipedia.org/wiki/Worth_4_dot_test

   It can be used to establish whether a patient has the ability for the eyes to fuse the light that is received from each eye into 4 lights. The test is indicated with the use of a presence of a prism in individuals with a strabismus and fusion is considered present if 4 lights are maintained, with or without the use of a prism. The W4LT can also ...