1. Ever wondered why the photopic curve is much less sensitive to the blue end of the spectrum.

2. And then indicate that different spectrum in photopic photometry, mesopic photometry, scotopic photometry and circadian photometry.

3. Like traditional "spot" photometers, the detector spectral response of Video Photometers is filtered to match the CIE Photopic response function for accurately weighted photometric measurements.

4. CONCLUSION: A practical and non-invasive method to detect the photopic F-ERG for adult cat is founded and it provided evidence for corresponding experimental researches.

5. Photoreceptors in the retina containing light sensitive pigments capable of initiating the process of photopic vision.