SUBJECT INDEX 



183 



Pigment epithelial layer, 6, 7, 16, 

 71 



cells of, 16 



in relation to rhodopsin, 86, 87, 120, 

 122, 130 



origin of, 48 



pigment of, in various vertebrates, 

 16, 17, 62, 67, 71, 74, 90 

 function of, 86-90, 92 

 Pigment migration, 74-92 



in various vertebrates, 74-83 

 Porphyropsin, 125-128 



absorption spectrum of, 126 



cycle, 127 



occurrence of, 126-128 



properties of, 126 

 Primary optic center, 19 

 Pupil, 9 



reaction of, 91 



slit (oval), 14, 15, 62, 65, 91, 92 



variations of, 14 



Refractive index, of retina, 118, 119 



of vitreous, 118, 119 

 Retina, cells of (see cells) 



degeneration of, 150-159 



differential staining of, 46, 84 



differentiation of, 48-59 



layers of, 18-20 



origin of, 16 



pars optica retinae, 16-18 



photopigments of, 120-142 



pigment of (see pigment of pigment 

 epithelial layer) 



refractive index of, 118, 119 



regeneration of, 157-159 



resolving power of, 94 



structure of, 16-37 



thickness of, in various vertebrates, 

 19-24 

 Retinine (visual yellow), 122, 124- 

 127, 133-142 



in relation to "droplets" of Kolmer 

 (see "droplets" of Kolmer) 



in relation to vitamin A, 133- 

 135 

 Rhodopsin (visual purple), 59, 62, 86, 

 88, 120-142 



absorption spectrum of, 120-122, 

 124, 126, 130 



cycle, 122-125 



in relation to "droplets" of Kol- 

 mer, 133, 134 



in relation to epithelial pigment, 

 120, 122 



in relation to the visual cycle, 124- 

 130, 133-142, 151 



regeneration. of, 86, 87, 121, 122 

 Rods, classification of, 45-47 



conducting systems of, 30-33, 35 



connections (endings) of, 25, 45 



degeneration of, in vitamin A defi- 

 ciency, 150-158 



differentiation of, 50-59 



double, 27 



function of, 37-39, 120 



green, 27, 62, 95 



in relation to visual acuity, 93-95 



measurements of, 20, 22, 23, 43 



nuclei of, 39, 84 



number of, 41 



origin of, 49 



photomechanical responses of, 47, 

 88-90 



photopigments of (see porphyrop- 

 sin and rhodopsin) 



red, 27, 62 



size of, 43, 94, 95 



staining reaction of, 46 



structure of, 39, 43 



thresholds of, 37, 94 



variations of, 43 

 Rosettes, 154-156 



Sclera, of various vertebrates, 4, 5 

 Suspensory ligament of lens, 7 



Tapeta, 6, 7, 16, 17, 61, 65, 66, 71, 87, 

 89, 98 (see choroid, specializa- 

 tion of) 

 Theory, duplicity, of von Kries, 37- 

 39, 73 

 of double retina of Parinaud, 37 

 of pigment migration, 86-92 

 of significance of the fovea (Walls), 



116-119 

 photochemical of Hecht, 122, 123 

 "transmutation" theory of Walls, 

 72, 73 

 Threshold of visual cells, 37 



Uvea (uveal tract), 6-12 



Vision, binocular, 109, 110, 112-114 

 diurnal, 60-73 

 nocturnal, 60-73 

 photopic, 35, 37 

 scotopic, 35, 37 



