The exaggerated eyes of fourth-century Roman emperors like Constantine the Great (illustration) reflect this character.[3] The concept found expression in poetry into the 17th century, most famously in John Donne's poem "The Extasie":
Our eye-beams twisted, and did thred Our eyes, upon one double string; So to'entergraft our hands, as yet Was all the meanes to make us one, And pictures in our eyes to get Was all our propagation.
In the same period John Milton wrote, of having gone blind, "When I consider how my light is spent", meaning that he had lost the capacity to generate eye beams.
Later in the century, Newtonian optics and increased understanding of the structure of the eye rendered the old concept invalid, but it was revived as an aspect of monstrous superhuman capabilities in popular culture of the 20th century.
In Algernon Swinburne's "Atalanta in Calydon" the conception is revived for poetic purposes, enriching the poem's pagan context in the Huntsman's invocation of Artemis:
Hear now and help, and lift no violent hand, But favourable and fair as thine eye's beam, Hidden and shown in heaven".
In T. S. Eliot's rose garden episode that introduces "Burnt Norton" eyebeams persist in the fusion of possible pasts and presents like unheard music:
The unheard music hidden in the shrubbery And the unseen eyebeam crossed, for the roses Had the look of flowers that are looked at.
The New Zealand poet Edward Tregear instanced "the lurid eye-beam of the angry Bull"— Taurus of the zodiac— among the familiar stars above the alien wilderness of New Zealand.[5]
In computer graphics, the concept of eye beams is resurrected in ray casting in which the bouncing of rays of light cast from a viewpoint around a scene is simulated computationally.[6]
↑ Aristotle understood sight correctly, as depending on light: On Sense and the Sensible 1.3; On the Soul 418b-419a.
↑ L. Safran, "What Constantine saw: reflections on the Capitoline Colossus, visuality and early Christian studies" Millennium 3' (2006:43-73), noted in Paul Stephenson, Constantine, Roman Emperor, Christian Victor, 2010: notes 333.
↑ B.S. Eastwood, "Mediaeval Empiricism: The Case of Grosseteste's Optics" Speculum: A Journal of Mediaeval Studies, 1968.
↑ Quoted in K. R. Howe, "The Dating of Edward Tregear's 'Te Whetu Plains', and an Unpublished Companion Poem" Journal of New Zealand Literature5 (1987:55-60) p. 58.
Ḥasan Ibn al-Haytham was a medieval mathematician, astronomer, and physicist of the Islamic Golden Age from present-day Iraq. Referred to as "the father of modern optics", he made significant contributions to the principles of optics and visual perception in particular. His most influential work is titled Kitāb al-Manāẓir, written during 1011–1021, which survived in a Latin edition. The works of Alhazen were frequently cited during the scientific revolution by Isaac Newton, Johannes Kepler, Christiaan Huygens, and Galileo Galilei.
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow.
Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent to the infrared and the ultraviolet, called collectively optical radiation.
Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Light is a type of electromagnetic radiation, and other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties.
A camera obscura is the natural phenomenon in which the rays of light passing through a small hole into a dark space form an image where they strike a surface, resulting in an inverted and reversed projection of the view outside.
Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears.
Robert Grosseteste, also known as Robert Greathead or Robert of Lincoln, was an English statesman, scholastic philosopher, theologian, scientist and Bishop of Lincoln. He was born of humble parents in Suffolk, but the association with the village of Stradbroke is a post-medieval tradition. Upon his death, he was revered as a saint in England, but attempts to procure a formal canonisation failed. A. C. Crombie called him "the real founder of the tradition of scientific thought in medieval Oxford, and in some ways, of the modern English intellectual tradition". As a theologian, however, he contributed to increasing hostility to Jews and Judaism, and spread the accusation that Jews had purposefully suppressed prophetic knowledge of the coming of Christ, through his translation of the Testaments of the Twelve Patriarchs.
The Form of the Good, or more literally translated "the Idea of the Good", is a concept in the philosophy of Plato. In Plato's Theory of Forms, in which Forms are defined as perfect, eternal, and changeless concepts existing outside space and time, the Form of the Good is the mysterious highest Form and the source of all the other Forms. It is a Platonic ideal.
A collimator is a device which narrows a beam of particles or waves. To narrow can mean either to cause the directions of motion to become more aligned in a specific direction, or to cause the spatial cross section of the beam to become smaller.
Emission theory or extramission theory or extromissionism is the proposal that visual perception is accomplished by eye beams emitted by the eyes. This theory has been replaced by intromission theory, which is that visual perception comes from something representative of the object entering the eyes. Modern physics has confirmed that light is physically transmitted by photons from a light source, such as the sun, to visible objects, and finishing with the detector, such as a human eye or camera.
Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek philosophers, and the development of geometrical optics in the Greco-Roman world. The word optics is derived from the Greek term τα ὀπτικά meaning 'appearance, look'. 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 studies on optics are now known as "classical optics". The term "modern optics" refers to areas of optical research that largely developed in the 20th century, such as wave optics and quantum optics.
In optics, the corpuscular theory of light states that light is made up of small discrete particles called "corpuscles" which travel in a straight line with a finite velocity and possess impetus. This notion was based on an alternate description of atomism of the time period.
The history of scientific method considers changes in the methodology of scientific inquiry, as distinct from the history of science itself. The development of rules for scientific reasoning has not been straightforward; scientific method has been the subject of intense and recurring debate throughout the history of science, and eminent natural philosophers and scientists have argued for the primacy of one or another approach to establishing scientific knowledge.
The Book of Optics is a seven-volume treatise on optics and other fields of study composed by the medieval Arab scholar Ibn al-Haytham, known in the West as Alhazen or Alhacen.
The natural sciences saw various advancements during the Golden Age of Islam, adding a number of innovations to the Transmission of the Classics. During this period, Islamic theology was encouraging of thinkers to find knowledge. Thinkers from this period included Al-Farabi, Abu Bishr Matta, Ibn Sina, al-Hassan Ibn al-Haytham and Ibn Bajjah. These works and the important commentaries on them were the wellspring of science during the medieval period. They were translated into Arabic, the lingua franca of this period.
Visual perception is the ability to interpret the surrounding environment through photopic vision, color vision, scotopic vision, and mesopic vision, using light in the visible spectrum reflected by objects in the environment. This is different from visual acuity, which refers to how clearly a person sees. A person can have problems with visual perceptual processing even if they have 20/20 vision.
Optics is a work on the geometry of vision written by the Greek mathematician Euclid around 300 BC. The earliest surviving manuscript of Optics is in Greek and dates from the 10th century AD.
A reflector sight or reflex sight is an optical sight that allows the user to look through a partially reflecting glass element and see an illuminated projection of an aiming point or some other image superimposed on the field of view. These sights work on the simple optical principle that anything at the focus of a lens or curved mirror will appear to be sitting in front of the viewer at infinity. Reflector sights employ some form of "reflector" to allow the viewer to see the infinity image and the field of view at the same time, either by bouncing the image created by lens off a slanted glass plate, or by using a mostly clear curved glass reflector that images the reticle while the viewer looks through the reflector. Since the reticle is at infinity, it stays in alignment with the device to which the sight is attached regardless of the viewer's eye position, removing most of the parallax and other sighting errors found in simple sighting devices.
Mardonius, also spelled Mardonios, was a Roman rhetorician, philosopher and educator of Gothic descent. Mardonius was the childhood tutor and adviser of the 4th century Roman emperor Julian, on whom he had an immense influence.
Medieval aesthetics refers to the general philosophy of beauty during the Medieval period. Although Aesthetics did not exist as a field of study during the Middle Ages, influential thinkers active during the period did discuss the nature of beauty and thus an understanding of medieval aesthetics can be obtained from their writings.
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