Text-book of ophthalmology . Path of rays in the case of an eccentrically situated pupil 978 446. Optical iridectomy 979 447. Iridectomy in increase of tension 979 448. Sclerotomy by De Weckers method 983 449. Lagranges operation—after De Schweinitz 985 450. Instruments for paracentesis and discission 988 451. Incision with the knife-needle in soft primary and in secondary cataract. 990 452. Instruments for cataract extraction 992 453. Linear extraction 993 454. Flap extraction with iridectomy 996 455. Flap extraction without iridectomy 996 456. Cross section through the anterior segment of an
Text-book of ophthalmology . Path of rays in the case of an eccentrically situated pupil 978 446. Optical iridectomy 979 447. Iridectomy in increase of tension 979 448. Sclerotomy by De Weckers method 983 449. Lagranges operation—after De Schweinitz 985 450. Instruments for paracentesis and discission 988 451. Incision with the knife-needle in soft primary and in secondary cataract. 990 452. Instruments for cataract extraction 992 453. Linear extraction 993 454. Flap extraction with iridectomy 996 455. Flap extraction without iridectomy 996 456. Cross section through the anterior segment of an eye, upon which an extrac- tion has been performed by means of a flap section 1000 457. Beers operation for cataract by inferior flap with a Beers knife 1003 458. Modified linear extraction by Von Graefes method 1004 459. Haabs giant magnet 1007 460. Instruments for tenotomy, advancement, and enucleation 1009 461. Advancement operations 1017 462. Temporary resection of the outer wall of the orbit 1029 PART I INTRODUCTION. OK OPHTHALMOLOGY INTRODUCTION GENERAL PHYSIOLOGY OF THE EYE 1. In many unicellular organisms—animals and plants, bacteria andprotozoa—sensitiveness to light is a property of the body as a whole. Inthe more highly organized, multicellular animals, sensitiveness to light is nolonger a function of the whole body, but is taken over by certain cells, which,in contradistinction to the rest, have retained the property of reacting tolight. In its simplest form a visual organ of this sort consists of an epithelialcell connected with a nerve fiber. The epithelial cell has the power oftransforming light into another form of energy of such a character that itcan be conducted along the nerve fiber to a central nerve organ. Eventhe eye of man is essentially reducible to the same type of apparatus, which,however, here is developed to the highest perfection. For here, instead ofa single sensory epithelial cell, there are an enormous number of such cells,which are unite
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