. The fundus oculi of birds, especially as viewed by the ophthalmoscope [microform] : a study in comparative anatomy and physiology. Ophthalmoscopy; Eye; Ophtalmoscopie; Oiseaux; Oeil; Birds. Fiff. 107. California Shrike (Laniua ludotieianut gambeli). FUNDUS OCULI OF BIHDS I\ PREPARED SPECIMENS 55 The Retina iiiiii the towels nj the chormd are prncticftlly invisible in the ,.yes of birds viewed niHcroscopicttlly a few minutes after death. However, when treated with Pcrenyi's fluid and otlier preservatives or espeeially in ease of sueressful carotid injections, the <horoi(hd bhiodvesseis and
. The fundus oculi of birds, especially as viewed by the ophthalmoscope [microform] : a study in comparative anatomy and physiology. Ophthalmoscopy; Eye; Ophtalmoscopie; Oiseaux; Oeil; Birds. Fiff. 107. California Shrike (Laniua ludotieianut gambeli). FUNDUS OCULI OF BIHDS I\ PREPARED SPECIMENS 55 The Retina iiiiii the towels nj the chormd are prncticftlly invisible in the ,.yes of birds viewed niHcroscopicttlly a few minutes after death. However, when treated with Pcrenyi's fluid and otlier preservatives or espeeially in ease of sueressful carotid injections, the <horoi(hd bhiodvesseis and tissues beeoiae more opaijue or at least more translucent and may then be studied with success. Doubtless the upli- flialmoseope gives us the one U-sl means of seeing these tissues as they exist during life, but both methods, supplemented by the mi- croscope, arc needed for a complete study of them in all their relation.^. Very little light is thrown on these (juestions by naked-eye ob- servations of the choroidal vessels, although in some birds, esiwcially when injections of car- mine have lieen mnde, they are quite evitient. Serial sections, in conjunction with the use of the ophthalmoscope, afford the best means of studying these fundal vessels. The pigment deposits and other histological elements in the choroid and retina â espe- cially in the former â that combine to nuike or modify the general coloration of the fundus oculi are best seen with the ophthalmoscoix-; prepared specimens furnish but slight indi- cations of these. Differences of level, as in â â â¢cular areas, are, however, well shown niacin. ^â^Ically. Areas of Distinct Vision. As a result of t le investigations of Slonaker and the writer i may be said of Birds with but a single i jvea that this sensitive area is gen-^rally :^laced about the center of the retina, slightly above and towards the nasal aspect of the optic nerve entrance. This observation is practically illustrated in a number of pictures r
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, booksubjecteye
