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day sight

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nyc·ta·lo·pi·a

(nik-tă-lō'pē-ă),
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
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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.
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