night sight


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

sight

 [sīt]
a thing seen.
far sight hyperopia.
near sight myopia.
night sight hemeralopia.

hem·er·a·lo·pi·a

(hem'ĕr-ăl-ō'pē-ă),
Inability to see as distinctly in a bright light as in reduced illumination; seen in patients with impaired cone function.
[G. hēmera, day, + alaos, obscure, + ōps, eye]

night sight

hemeralopia

Term used to mean either night blindness in which there is a partial or total inability to see in the dark associated with a loss of rod function or vitamin A deficiency; or day blindness in which there is reduced vision in daylight while vision is normal in the dark. Syn. nyctalopia (this term is only synonymous with night blindness); night sight (this term is only synonymous with day blindness). See girate atrophy; congenital stationary night blindness; choroideremia; Oguchi's disease; retinitis pigmentosa.
References in periodicals archive ?
After changing a large number of sights--and if you work in a retail gun shop, night sights are a steady item--you will note this as well.
India's Defence Research and Development Organisation is to design the night sight used on the Indian Army's Close Quarter Carbine rifle.
Whatever fate awaits Night Sight, Fallon can still go home with a winner as Topton can repeat last year's victory in the Doncaster Chamber Sponsorship Preview Handicap off a pound lower mark.
Night Sight, who is 6lb lower than his last win over two years ago, has since finished a creditable third to Trance and Loves Travelling at Doncaster.
Night Sight has been running with consistency this term and, provided he finds daylight when he he needs it, he should be knocking on the door at the business end.
Using thermal imaging common modules provided by Thorn EMI, of the UK, Bofors Aerotronics is also producing the night sight for the RBS56 Bill infantry anti-tank missile.
56 mm insas passive night sight devices for use of kolkata police
72 rating); AN/PVS-24A Individual Weapon Night Sight Image Intensifier (4.
The reticle for the M249 comes with NSN 5855-01-039-2853, but it can be used only with the AN/PVS-4 night sight, which also requires a mounting bracket, NSN 3040-01-233-0352, for the M249.
The Grand Raptor II features an adjustable night sight, black aluminum match grade trigger, bumped and grooved grip safety and rosewood grips.
NIGHT SIGHT, whose bid for a hat-trick ended in honourable defeat at Royal Ascot last month, is napped to return to winning ways in the Tote Old Newton Cup (3.
Royal Ascot's Duke of Edinburgh Stakes looks one of the key events for this contest with Counsel's Opinion, Red Carnation, Night Sight, Takamaka Bay, Tamiami Trail and Heredotus all having run in the race.