List of Cone Ratios

Cone ratios are known for a range of animals. They are necessary to calculate channel specific noise levels. We have started to compile a list of cone ratios here. This list is based on the summary in Olsson et al. 2017. If you are aware of others, please let us know in the forum and we will continue to add to this list. Please keep in mind that many animals do not have homogeneous retinas (e.g. these ratios differ across different areas) which can be of importance in specific contexts (e.g. Sibeaux et al. 2019). Some of the ratios reported here appear to be estimates themselves where the cited reference shows those being used but does not necessarily indicate the true origin of the ratio. We have indicated such cases with an asterix. It is crucial that you cite the precise origin and nature (estimate or actual morphological data) of your cone ratios in your research. Some of these ratios include a luminance channel (e.g. R. aculeatus). This is indicated in bold. This channel and its channel specific noise (Or weber fraction) is what needs to be used to calculate RNL luminance contrast (Siddiqi et al. 2004).