special visual effects, as the wipe or dissolve, created in the camera or especially in a film laboratory by technicians using complex optical and electronic equipment.
Also called opticals.
Examples from the web for optical effects
They were leading-edge optical effects at the time, showing the spaceships and things.
The prisms are activated via nonlinear optical effects in the semiconductor and persist for the duration of the sweep.
Camera angles, optical effects, and background atmosphere come primarily through experience.
The heavier ash sedimented out of the stratosphere relatively quickly and its optical effects were of limited geographical extent.
One of the more spectacular cold-weather atmospheric optical effects is referred to as an ice-pillar.
Due to surface tension and optical effects there are multiple lines visible in the scope.