visual threshold

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vis·u·al thresh·old

, threshold of visual sensation
the minimal light intensity evoking a visual sensation.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
The scotopic visual threshold of juvenile Pacific bluefin tuna for optomotor reactions was at least 40-fold inferior to the threshold of four marine teleosts: grouper (Epinephelus septemfasciatus), purplish amberjack (Seriola dumerili), ocellate puffer (Takifugu rubripes), and red sea bream (Pagrus major) (Ishibashi et al., 2009).
Visual threshold and spectral sensitivity of herring larvae.
But if the contrast it makes with the surrounding planetary disk is below the visual threshold (less than about 0.1), the detail or feature will be invisible.
Color-coded visual thresholds and standard PC audio file (.wav) alarms can be set, and agents can determine the data fields they are most interested in viewing.