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2. Refractive error - Wikipedia

   en.wikipedia.org/wiki/Refractive_error

   The individual would experience difficulty in near vision, often relieved by reading glasses, bifocal, or progressive lenses. [15] Astigmatism is when the refractive power of the eye is not uniform across the surface of the cornea because of asymmetry. In other words, the eye focuses light more strongly in one direction than another, leading to ...

3. Hirschberg test - Wikipedia

   en.wikipedia.org/wiki/Hirschberg_test

   Negative Hirschberg sign: the reflections form congruent points on both corneas. It is performed by shining a light in the person's eyes and observing where the light reflects off the corneas. In a person with normal ocular alignment the light reflex lies slightly nasal from the center of the cornea (approximately 11 prism diopters—or 0.5mm ...

4. Flashcard - Wikipedia

   en.wikipedia.org/wiki/Flashcard

   Paper flashcards have been used since at least the 19th century. Reading Disentangled (1834), a set of phonics flashcards by English educator Favell Lee Mortimer, is believed by some to be the first known usage of flashcards. [5] A single-sided hornbook was also known to have been used for early literacy education.

5. List of flashcard software - Wikipedia

   en.wikipedia.org/wiki/List_of_flashcard_software

   Software Microsoft Windows. macOS. ChromeOS. Linux. Android. iOS (iPhone, iPod Touch, iPad) . BlackBerry. Windows Mobile, Pocket PC Maemo. Web browser J2ME. Palm OS ...

6. Snell's law - Wikipedia

   en.wikipedia.org/wiki/Snell's_law

   Refraction of light at the interface between two media of different refractive indices, with n 2 > n 1. Since the velocity is lower in the second medium (v 2 < v 1), the angle of refraction θ 2 is less than the angle of incidence θ 1; that is, the ray in the higher-index medium is closer to the normal.

7. History of optics - Wikipedia

   en.wikipedia.org/wiki/History_of_optics

   The word optics is derived from the Greek term τα ὀπτικά meaning 'appearance, look'. [1] Optics was significantly reformed by the developments in the medieval Islamic world, such as the beginnings of physical and physiological optics, and then significantly advanced in early modern Europe, where diffractive optics began. These earlier ...