Figure 5. Depth discrimination thresholds for five animals placed in darkness immediately after a period of MD reveal only two showed evidence of stereopsis despite the absence of amblyopia .

Results of measurements of depth discrimination on ten successive daily testing sessions in which binocular thresholds (filled circle symbols) were measured immediately prior to a monocular threshold that was alternated between the right (upright triangle symbols) and left (inverted triangle symbols) eye each day. Depth discrimination thresholds represent the smallest detectable difference in depth (ΔD) between two adjacent surfaces seen through the masked glass top of the jumping stand expressed as a percentage of the distance of the cat from the more distant (D) of the two surfaces. Occasions for which a cat failed to detect the nearest surface when separated by the maximum amount (24.7%) are denoted by the letter ‘F’. Where variation existed in the daily thresholds the means and bootstrapped 95% CIs are shown to the right, respectively, by a horizontal and an intersecting vertical line. Corresponding values for normal animals from previous studies are shown to the left.