Using tungsten microelectrodes, electrical potentials were recorded directly from the rabbit retina. These responses were not obliterated by isolated clinical photocoagulations of grade 1 to 2 intensity, using the ruby laser.
Banyard RD, Noyori KS, Campbell CJ, Marg E. Retinal Effects of Ruby Laser PhotocoagulationMicroelectrode Recordings in the Rabbit. Arch Ophthalmol. 1971;85(1):107-110. doi:10.1001/archopht.1971.00990050109017