Etymology
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dream (n.)

"sequence of sensations or images passing through the mind of a sleeping person," mid-13c., probably related to Old Norse draumr, Danish drøm, Swedish dröm, Old Saxon drom "merriment, noise," Old Frisian dram "dream," Dutch droom, Old High German troum, German Traum "dream." These all are perhaps from a Proto-Germanic *draugmas "deception, illusion, phantasm" (source also of Old Saxon bidriogan, Old High German triogan, German trügen "to deceive, delude," Old Norse draugr "ghost, apparition"). Possible cognates outside Germanic are Sanskrit druh- "seek to harm, injure," Avestan druz- "lie, deceive."

Old English dream meant "joy, mirth, noisy merriment," also "music." Much study has failed to prove that Old English dream is the source of the modern word for "sleeping vision," despite being identical in form. Perhaps the meaning of the word changed dramatically, or "vision" was an unrecorded secondary Old English meaning of dream, or there are two words here.

OED offers this theory for the absence of dream in the modern sense in the record of Old English: "It seems as if the presence of dream 'joy, mirth, music,' had caused dream 'dream' to be avoided, at least in literature, and swefn, lit. 'sleep,' to be substituted ...."

The dream that meant "joy, mirth, music" faded out of use after early Middle English. According to Middle English Compendium, the replacement of swefn (Middle English swevn) by dream in the sense "sleeping vision" occurs earliest and is most frequent in the East Midlands and the North of England, where Scandinavian influence was strongest.

Dream in the sense of "that which is presented to the mind by the imaginative faculty, though not in sleep" is from 1580s. The meaning "ideal or aspiration" is from 1931, from the earlier sense of "something of dream-like beauty or charm" (1888). The notion of "ideal" is behind dream girl (1850), etc.

Before it meant "sleeping vision" Old English swefn meant "sleep," as did a great many Indo-European "dream" nouns originally, such as Lithuanian sapnas, Old Church Slavonic sunu, and the Romanic words (French songe, Spanish sueño, Italian sogno all from Latin somnium. All of these (including Old English swefn) are from PIE *swep-no-, which also is the source of Greek hypnos (from PIE root *swep- "to sleep"). Old English also had mæting in the "sleeping vision" sense.

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descry (v.1)

c. 1300, descriven, "to see, discern," probably from Old French descrier "publish, proclaim, announce" (Modern French décrier), from Latin describere "to write down, copy" (see describe). From mid-14c. as "detect, find out, discover" (something concealed), also "discover by vision, get sight of." Since early 15c. the word has been more or less confused with descry (v.2). Related: Descried; descrying.

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viz. 
1530s, abbreviation of videlicet "that is to say, to wit, namely" (mid-15c.), from Latin videlicet, contraction of videre licet "it is permissible to see," from videre "to see" (see vision) + licet "it is allowed," third person singular present indicative of licere "be allowed" (see licence). The -z- is not a letter, but originally a twirl, representing the usual Medieval Latin shorthand symbol for the ending -et. "In reading aloud usually rendered by 'namely.' " [OED]
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view (n.)
early 15c., "formal inspection or survey" (of land); mid-15c., "visual perception," from Anglo-French vewe "view," Old French veue "light, brightness; look, appearance; eyesight, vision," noun use of fem. past participle of veoir "to see," from Latin videre "to see" (from PIE root *weid- "to see"). Sense of "manner of regarding something" attested from early 15c. Meaning "sight or prospect of a landscape, etc." is recorded from c. 1600.
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perspicacity (n.)

"state or character of being perspicacious; keenness of sight, clearness of understanding," 1540s, from French perspicacité (15c.) and directly from Late Latin perspicacitas "sharp-sightedness, discernment," from Latin perspicax "sharp-sighted, having the power of seeing through," from perspicere "look through, look closely at," from per "through" (from PIE root *per- (1) "forward," hence "through") + specere "look at" (from PIE root *spek- "to observe"). An earlier word was perspicience "ability to see all things, infinite vision" (c. 1400).

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video (adj.)

1935, as visual equivalent of audio, from Latin video "I see," first person singular present indicative of videre "to see" (see vision). As a noun, "that which is displayed on a (television) screen," 1937.

Engineers, however, remember the sad fate of television's first debut and are not willing to allow "video transmission" (as television is now called by moderns) to leave the laboratory until they are sure it will be accepted. [The Michigan Technic, November 1937]

video game is from 1973.

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*weid- 
Proto-Indo-European root meaning "to see."

It forms all or part of: advice; advise; belvedere; clairvoyant; deja vu; Druid; eidetic; eidolon; envy; evident; guide; guidon; guise; guy (n.1) "small rope, chain, wire;" Gwendolyn; Hades; history; idea; ideo-; idol; idyll; improvisation; improvise; interview; invidious; kaleidoscope; -oid; penguin; polyhistor; prevision; provide; providence; prudent; purvey; purview; review; revise; Rig Veda; story (n.1) "connected account or narration of some happening;" supervise; survey; twit; unwitting; Veda; vide; view; visa; visage; vision; visit; visor; vista; voyeur; wise (adj.) "learned, sagacious, cunning;" wise (n.) "way of proceeding, manner;" wisdom; wiseacre; wit (n.) "mental capacity;" wit (v.) "to know;" witenagemot; witting; wot.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit veda "I know;" Avestan vaeda "I know;" Greek oida, Doric woida "I know," idein "to see;" Old Irish fis "vision," find "white," i.e. "clearly seen," fiuss "knowledge;" Welsh gwyn, Gaulish vindos, Breton gwenn "white;" Gothic, Old Swedish, Old English witan "to know;" Gothic weitan "to see;" English wise, German wissen "to know;" Lithuanian vysti "to see;" Bulgarian vidya "I see;" Polish widzieć "to see," wiedzieć "to know;" Russian videt' "to see," vest' "news," Old Russian vedat' "to know."
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blindfold (v.)
"to cover the eyes to hinder from seeing," a mistaken formation ultimately from Old English (ge)blindfellian "to strike blind," from blind (adj.) + Anglian gefeollan "to strike down, make fall, cause to fall" (see fell (v.1)).

This became Middle English blindfellen "to strike blind," also "to cover (the eyes) to block vision" (c. 1200). This was most common in the past-participle, blindfelled, blindfeld," whence the -d was, in the 15th c., erroneously admitted to the stem of the vb." [OED]. It was further altered early 16c. by similarity to fold, from the notion of "folding" a band of cloth over the eyes. Related: Blindfolded; blindfolding.
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fantasy (n.)

early 14c., "illusory appearance," from Old French fantaisie, phantasie "vision, imagination" (14c.), from Latin phantasia, from Greek phantasia "power of imagination; appearance, image, perception," from phantazesthai "picture to oneself," from phantos "visible," from phainesthai "appear," in late Greek "to imagine, have visions," related to phaos, phōs "light," phainein "to show, to bring to light" (from PIE root *bha- (1) "to shine").

Sense of "whimsical notion, illusion" is pre-1400, followed by that of "fantastic imagination," which is first attested 1530s. Sense of "day-dream based on desires" is from 1926. In early use in English also fantasie, phantasy, etc. As the name of a fiction genre, by 1948.

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fade (v.)

early 14c., "lose brightness, grow pale," from Old French fader "become weak, wilt, wither," from fade (adj.) "pale, weak; insipid, tasteless" (12c.), probably from Vulgar Latin *fatidus, which is said to be a blending of Latin fatuus "silly, tasteless" and vapidus "flat, flavorless." Related: Faded; fading. Of sounds, by 1819. Transitive sense from 1590s; in cinematography from 1918.

Adieu! adieu! thy plaintive anthem fades
  Past the near meadows, over the still stream,
    Up the hill-side; and now 'tis buried deep
      In the next valley-glades:
Was it a vision, or a waking dream?
  Fled is that music:" Do I wake or sleep?
[Keats, from "Ode to a Nightingale"]
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