Spray angles are typically measured using optical or mechanical methods.

These optical methods are classified as either spatial or flux based.

Analysis is usually performed using culture, biochemical and sometimes optical methods.

Later, sound was added to the film itself using an optical method, and even later a magnetic track.

First use of optical methods in the creation of art.

The MP21's optical method isn't the only new way to keep tabs on games.

Here, particularly optical methods are utilized for brain research and brain control.

This optical method is of little use for limestones.

The enantiomeric excess of a substance can also be determined using certain optical methods.

"We just wanted to prove in principle that optical methods could do this job," he said.