blind

blind (blind) [A.S.]

1. not having the sense of sight.

2. pertaining to a clinical trial or other experiment in which one or more of the groups receiving, administering, and evaluating the treatment are unaware of which treatment any particular subject is receiving.

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blind (blnd)

adj.

1. Unable to see; without useful sight.

2. Having a maximal visual acuity of the better eye, after correction by refractive lenses, of one-tenth normal vision or less (20/200 or less on the Snellen test).

3. Of, relating to, or for sightless persons.

4. Closed at one end, as a tube or sac.

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blindness n.

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blind

not having the sense of sight. See also blindness.

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double blind trial

an experiment in which the identity of the animals in the treatment and control groups is unknown to the experimenter and in addition the assessment of the results is done without the animals' identities being known to the experimenter. Called also blind study.

blind experiment

the identities of the animals that are in the treatment and the control groups are unknown to the experimenter until the end of the trial.

blind snakes

see typhlopid.

blind spot

the area marking the site of entrance of the optic nerve on the retina; it is not sensitive to light.

blind staggers

see dummy.

blind study

see double blind trial (above).

blind teat

see blind teat.