(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 3. A single V-logI curve from a lower lens eye. Data points (open
circles) show how the response changed with changing light intensity (I; W
m-2 sr-1), while the model fit (solid line) shows the
sigmoid shape of this response. For each preparation the
V-logI-based model fit was used to calculate spectral
sensitivity for that preparation (see text for details).