cylindrical lens n.
A lens in which one of the surfaces is curved in one meridian and less curved in the opposite meridian. Also called astigmatic lens.
Between the prism and the cylindrical lens may be seen the colours, tracking themselves through the dust of the room.
It is corrected by a cylindrical lens that compensates for this defect of the eye.
A cylindrical lens is placed close to the enlarging lens, with its axis parallel to the length of the spectrum.
Astigmatism is corrected by a cylindrical lens, which is in fact a segment of a solid cylinder of glass.