A 130mm to 200mm telescope will be needed to visually detect this pair of galaxies.

Various faults in the magnetic recording process could then be visually detected.

Several laws describe a human's ability to visually detect targets on a uniform background.

The base is constructed in the center of a crater, and is difficult to detect visually.

A cavitation is a hole in the blood vessel that cannot be visually detected with the naked eye.

After the boost, Krikalev reported that he was unable to visually detect the change in altitude.

Other solder defects can be detected visually as well.

The term is also used in cardiology as a tool to visually detect abnormalities using body surface distribution.

The injected material is detected visually and/or with a probe that detects radioactivity (middle panel).

Scattered light from the star makes studying the galaxy more difficult, and it was not until the 1990s that it was detected visually.