Correct spelling for the English word "peripheraphose" is [pəɹˈɪfəɹˌafə͡ʊz], [pəɹˈɪfəɹˌafəʊz], [p_ə_ɹ_ˈɪ_f_ə_ɹ_ˌa_f_əʊ_z] (IPA phonetic alphabet).
The subjective sensation of a dark spot or patch, the cause residing in the eye itself or the optic nerve, outside of the optic center in the brain.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
There doesn't seem to be any information available about the word "peripheraphose". It is possible that this is a made-up or rare word with no widely recognized etymology.