(firearms) On some rifles, a type of sight where the shooter looks through a small aperture on the rear sight.

myopic; unable to see distant objects unaided

(literally) Not accessible to view. / (idiomatic, of a goal, aspiration, etc) Not yet attainable. / (dated, idiomatic, colloquial) Superb, excellent. / (idiomatic, colloquial) Very expensive.

(idiomatic) Not having seen the object beforehand.

A straight line along which an observer has a clear view. / (weaponry) The line which passes through the front and rear sight, at any elevation, when they are sighted at an object.

Alternative form of eyesight

(music) To perform a musical piece while reading it for the first time, without rehearsal.

Near-sighted; myopic; unable to focus on distant objects. / (figuratively) Unable to see long-term objectives; lacking foresight.

Having sharp vision. / Acutely perceptive or discerning; perspicacious.

A person who is able to sightread.