Table 4. Total of retinal ganglion cell bodies or optic nerve axons in catarrhines and platyrrhines estimated by using different techniques. Data were rounded to the thousands. Estimates from retinal area are also listed.
| Species | Retinal Area (mm2) | Retinal Ganglion Cells (Total) | N | Optic Nerve Axons (Total) | N | Ref |
| Alouatta caraya | 641 | 1,134,000 | 5 | - | - | * |
| Alouatta caraya | - | - | - | 1,081,000 | 4 | [35] |
| Cebus apella | 611 | 1,400,000 | 6 | - | - | [34] |
| Cebus apella | 565 | - | - | 1,077,000 | 1 | [35] |
| Saimiri ustius | 352 | - | - | 853,000 | 4 | [35] |
| Callicebus moloch | - | - | - | 701,000 | 2 | [35] |
| Saguinus midas niger | 258 | - | - | 677,000 | 2 | [35] |
| Aotus trivirgatus | 660 | 479,000 | 4 | - | - | [38] |
| Aotus azarae | 595 | - | - | 496,000 | 3 | [35] |
| Macaca mulatta | - | - | - | 1,230,000 | 2 | [83] |
| Macaca mulatta | - | - | - | 1,410,000 | 1 | [84] |
| Macaca mulatta | - | - | - | 1,621,000 | 3 | [85] |
| Macaca mulatta | - | - | - | 1,250,000 | 2 | [86] |
| Macaca mulatta | 670 | 1,600,000 | 2 | - | - | [41] |
| Cercopithecus aethiops sabeus | 707 | 1,227,000 | 5 | 1,276,000 | 5 | [63] |
| Papio Anubis | 793 | 1,478,000 | 4 | 1,789,000 | 2 | [64] |
| Homo sapiens | - | - | - | 1,270,000 | 6 | [87] |
| Homo sapiens | - | - | - | 1,010,000 | 10 | [83] |
| Homo sapiens | - | 1,222,000 | 5 | - | - | [88] |
| Homo sapiens | - | - | - | 1,100,000 | 1 | [89] |
| Homo sapiens | - | - | - | 1,218,000 | 2 | [85] |
| Homo sapiens | - | - | - | 964,000 | 5 | [90] |
| Homo sapiens | - | - | - | 1,244,000 | 16 | [91] |
| Homo sapiens | - | - | - | 1,084,000 | 13 | [92] |
| Homo sapiens | - | - | - | 693,000 | 19 | [93] |
| Homo sapiens | 1,012 | 1,070,000 | 4 | - | - | [58] |
| Homo sapiens | - | - | - | 1,158,000 | 72 | [94] |
*This work.