The other eye socket had an optical reader jutting out of it.

A special optical reader is mounted on the projector.

An optical reader inside the watch measures the color and calculates the person's blood-sugar level.

The back will also contain an optical reader and the chip.

Most counties surveyed programmed the optical readers to alert poll workers to double voting.

It even has a built-in digital optical reader that quickly registers exact position in the game.

Winters reached into a satchel and brought out an optical reader.

So were the optical readers, devices that scan the cards and send notice of a completed trade back to the brokerage houses.

Sometimes the digits represented by the dark and light bars are also printed to allow people to read the number without an optical reader.

Later optical readers used the sprocket holes to generate timing pulses.