sight

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sight:

see visionvision,
physiological sense of sight by which the form, color, size, movements, and distance of objects are perceived. Vision in Humans

The human eye functions somewhat like a camera; that is, it receives and focuses light upon a photosensitive receiver, the retina.
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.

sight

[sīt]
(navigation)
(ordnance)
Mechanical or optical device for aiming a firearm or for laying a gun or launcher in position.
To aim at a target or aiming point.
(physiology)

sight

i. An optical device for the measurement of drift. See drift indicator.
ii. An aiming device for aiming weapons. It may be a part of a head-up display or a separate unit. It may be fixed, gyro, or electronic. See sight glass (iii).
iii. To make an observation of a heavenly body with a sextant.

sight

1. the power or faculty of seeing; perception by the eyes; vision
2. any of various devices or instruments used to assist the eye in making alignments or directional observations, esp such a device used in aiming a gun
3. an observation or alignment made with such a device
References in periodicals archive ?
I wanted the shooters to be able to take sighters, so I put the target in the middle of a white piece of paper measuring approximately 36" wide by about 50" tall.
Look at a bore sighter while turning them to check for that problem.
Although he would appear a little tetchy on that evidence, Another Cocktail is clearly talented and will be raring to go here with that sighter in the bag.
In all probability O'Brien will have bigger guns to fire at the premier Classic in June, but this 10-furlong conditions event will give him a sighter.
Now six and clearly better for a sighter at Ascot, the 16-1 chance came with a strong late run under Martin Dwyer to beat Class Is Class and Principal Role by two heads.
The Marju filly - out of a halfsister to Soviet Song - was denied by a head on her debut at Windsor and, with that sighter in the bag, is open to any amount of experience.
A flop with the ladies in the paddocks, he returned to the track in the care of Sir Michael Stoute and after a sighter at Royal Ascot, Kingsgate proved he was no spent force when scoring impressively over five furlongs at Glorious Goodwood.
Both sides rested players ahead of the play-offs, but Dale had an early sighter when Will Buckley twice went close.
Champion trainer Paul Nicholls is likely to see this Becher Chase as an ideal sighter for the world's greatest steeplechase in April.
The visitors' Steve Howard fired an early sighter over the bar before Jon Stead had an effort blocked by Foster.
Scott Murray fired an early sighter for the visitors in the second period - which Smith held - before Commons was denied by Basso.
The new Shotgun Laser Bore Sighter allows the sighting or alignment of shotguns quickly, safely and accurately without firing a round.