By Georg Eisner
It offers me specific excitement to put in writing the foreword to this publication; this can be principally given that i've got committed a considerable a part of my existence to the enhance ment of the tools utilized in ophthalmic study. hardly has one among my scholars taken the possibility of dealing systematically with the chances of those equipment. Dr. Eisner is, although, this type of exceptions. First, he has considerably enhanced the indentation touch glass; secondly, he has, with untiring enthusiasm, made a scientific choice of the traditional and pathologic findings, which, with the aid of the indentation touch glass and the slit lamp, could be saw within the outermost outer edge of the fundus and the ciliary physique. He has in comparison them to findings bought with mild magnification in post-mortem eyes and to histological sections. because of a lucky condition, W. Hess, who's either a very good draughts guy and a grasp of the precise exam method, was once capable of reproduce the visible phenomena faithfully. The reader who attempts to interpret those illustrations spatially will detect that this was once usually challenging. it's a approach which calls for a undeniable attempt of imagi state of area, yet that's very lucrative. Dr. Eisner's monograph is an advent to a little-known department of biomicroscopy which broadens our technique of analysis and grants extra fascinating points for the long run. I want him well-earned success.
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Extra resources for Biomicroscopy of the Peripheral Fundus: An Atlas and Textbook
Characteristically, they are connected with vascular anonlalies, since abnormally large, tortuous or anastomosing vessels penetrate the cones at their bases. A vitreous strand branches off from the peak of these cones; it is relatively broad and may strongly reflect the light beam. This strand may be followed for a short distance in a radial direction towards the centre of the eyeball, where it disappears from view. Studies in autopry ryes  demonstrate that the adhering vitreous strands run within a round defect in the vitreous cortex.
The anterior hyaloid membrane extends over them at some distance, bridging the intervals between neighbouring cysts. Pathological adhesions or extensions of the vesicular wall, which might be a sign of traction, have not been observed biomicroscopically. 39 Table 4. Pars-plana cysts in biomicroscopic examinations Age 4--21 21-40 41-60 >60 Number of patients (eyes) Microcysts Macrocysts Macro- and microcysts in the same eye Total of pars-plana cysts 26 (44) 0 0 1 (2) 1 (2) 35 (52) 1 (1) 0 0 1 (1) 27 2 1 3 6 25 (45) 3 (5) 1 (2) 2 (4) 6 (11) (49) (4) (2) (4) (10) Pars-plana cysts in autopsy eyes (after Okun ) Age 1-20 21-40 41-60 >60 Number of autopsies Pars-plana cysts 62 0 19 0 66 8 104 32 The evolution of" pars-plana cysts" can be followed biomicroscopically.
Details of the insertion are difficult to determine because of light reflected from the retina. For the same reason the vitreous cortex can only be evaluated in silhouette against a black background. In biomicroscopic examination the cortex appears structurdess and "optically empty". The typical pattern present in slit-lamp examinations of autopsy eyes  is not visible because the angle of illumination is too small in biomicroscopic examination. Only occasionally a very fine pattern can be dimly seen; coarser opacities within the cortex are of pathological nature.