day sight

Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.


Decreased ability to see in reduced illumination. Seen in patients with impaired rod function; often associated with a deficiency of vitamin A.
[nyct- + G. alaos, obscure, + ōps, eye]
Farlex Partner Medical Dictionary © Farlex 2012


(sit) [AS. sihth]
1. The power or faculty of seeing.
2. Range of sight.
3. A thing or view seen. Synonym: vision; visual perception

blind sight

The ability to see that occurs in persons who are blind because of a brain lesion rather than damage to the eye. It is manifested by their being able to reach for and track an object. These individuals apparently do not know they can see.

day sight

Night blindness.

far sight


near sight


night sight

Day blindness.

old sight


second sight

Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
The day sight uses a small lens cap and the night sight takes a large lens cap.
The fire control system includes a day sight optics, an eyesafe laser rangefinder with an absolute error of less than [+ or -] one metre for ranges up to 1200 metres (undetectable by image intensifiers) and a ballistic calculator with a sensor suite including air and weapon temperature, air pressure, angle of sight and canting, data from which provide the angle of elevation.
Away from its American customers, the company equips the Israel Defense Force's new HS Precision .338 2000 series heavy tactical rifles with a Mk 4 LR/T x6.5 to x20 day sight. These weapons are also equipped with an Omnitech Partners AN/PVS-27 Magnum clip-on night sight (see below).
This will house a red-dot day sight for the weapon and also a night sight.
It is equipped with a 1P3-9 day sight and a TPN-3 (or TPN-3-42) night sight, which are mounted in the roof of the turret.