It gives me particular pleasure to write the foreword to this book; this is largely due to the fact that I have devoted a substantial part of my life to the improve- ment of the methods used in ophthalmic research. Rarely has one of my students taken the opportunity of dealing systematically with the possibilities of these methods. Dr. Eisner is, however, one of these exceptions. First, he has substantially improved the indentation contact glass; secondly, he has, with untiring enthusiasm, made a systematic collection of the normal and pathologic findings, which, with the help of the indentation contact glass and the slit lamp, can be observed in the outermost periphery of the fundus and the ciliary body. He has compared them to findings obtained with slight magnification in autopsy eyes and to histological sections. Owing to a fortunate circumstance, W. Hess, who is both an excellent draughts man and a master of the special examination technique, was able to reproduce the visual phenomena faithfully. The reader who tries to interpret these illustrations spatially will discover that this was often not easy. It is a process which requires a certain effort of imagi- nation of space, but which is very rewarding. Dr. Eisner's monograph is an introduction to a little-known branch of biomicroscopy which broadens our means of diagnosis and promises further interesting aspects for the future. I wish him well-earned success.

Table of Contents:
I. The Principles of Indentation.- 1. The Optical Phenomena of Indentation.- 2. The Effects of Indentation on the Eyeball.- 3. Instruments for Indentation Biomicroscopy.- 4. Indentation Funnel with Immobile Indenter.- 5. Funnel with Variable Indenter Length.- 6. Practical Application of the Indentation Funnel.- 6.1. Insertion of the Indentation Contact Glass into the Palpebral Fissure.- 6.2. Course of the Examination.- 7. Contra-Indications.- II. The Anatomy of the Extreme Periphery of the Fundus.- 1. Topography of the Extreme Periphery of the Fundus.- 2. Retina and Ciliary Body.- 3. The Zonule.- 4. The Vitreous Body.- 5. Growth and Ageing.- 5.1. The Retina and the Ciliary Body.- 5.2. The Vitreous Body.- 5.3. The Zonule.- III. The Examination of the Normal Periphery of the Fundus.- IV. Variations in the Periphery of the Fundus.- 1. The Peripheral Retina.- 1.1. Changes within the Retinal Lamina.- 1.1.1. Cystoid Degeneration.- 1.1.2. Senile Retinoschisis.- 1.2. Changes on the Inner Retinal Surface.- 1.2.1. Equatorial Vitreoretinal Degenerations.- 1.2.2. Paravascular Vitreoretinal Attachments.- 1.2.3. Angioids.- 1.2.4. Retinal Glistening Dots.- 1.2.5. The Problem of Vitreoretinal Adhesions.- 1.2.6. "White with Pressure".- 1.3. Changes in the External Layers.- 1.3.1. Senile Choriatrophy (Paving-Stone Degeneration).- 2. The Pars Plana Corporis Ciliaris.- 2.1. The Detachment of the Ciliary Epithelium (Pars-Plana Cysts).- 2.2. The Detachment of the Pars Plana.- 3. The Vitreous in the Periphery of the Fundus.- 3.1. Definition of the Vitreous Base.- 3.2. The Anterior Hyaloid Membrane.- 3.3. The Posterior Hyaloid Membrane.- 3.4. The Extent of the Vitreous Base.- 3.5. The Vitreal Structures within the Vitreous Base.- 3.6. The Previtreal Space.- 4. The Transitional Zone of the Ora Serrata.- 4.1. Transitional Structures.- 4.1.1. Retinal Ectopies above the Pars Plana.- 4.1.2. Ectopies of Ciliary Epithelium.- 4.1.3. Ectopies of Vitreous and Zonula Fibres.- 4.2. The Form of the Retinal Edge.- 4.3. The Course of the Boundary Line.- 4.4. Meridional Ridges ("Folds").- 4.5. Micro-Adhesions.- V. The Pathology of the Peripheral Fundus.- 1. Intravitreal Changes Accompanying the Spreading of Pathological Processes into the Vitreous Space.- 2. Inflammations in the Peripheral Fundus.- 2.1. Concomitant Signs of Anterior Uveitis.- 2.2. Inflammations of the Ciliary Body Localized in the Pars Plana . ..- 2.2.1. Diffuse Inflammations.- 2.2.2. Focal Inflammations.- 2.3. Peripheral Exudates Connected with an Inflammation of the Posterior Sections of the Fundus.- 2.4. Mixed Forms.- 3. Amotio Retinae.- 3.1. The Expansion of Retinal Detachment to the Ciliary Body.- 3.2. Changes in the Peripheral Fundus as a Cause of Retinal Detachment.- 4. Traumatic Lesions in the Extreme Periphery of the Fundus.- 4.1. Contusions.- 4.1.1. Post-Traumatic Vitreous Detachment.- 4.1.2. Partial-Thickness Tears of the Retina.- 4.1.3. Full-Thickness Tears of the Retina.- 4.1.4. Traumatic Retinal Necrosis.- 4.2. Perforations of the Eye.- 4.3. Indications for Indentation after Trauma.- 5. Tumours.- 5.1. Ciliary Body Tumours.- 5.2. Retinal Tumours.- Conclusion.- Illustrations.- Principles of Indentation Fig. 1-6.- Instruments Fig. 7-13.- Technique of Examination Fig. 14-18.- Anatomy Fig. 19-35.- Presentation of Drawings of the Peripheral Fundus in the Following Figures.- Normal Fundus Fig. 36-40.- Cystoid Degeneration Fig. 41-48.- Schisis Retinae Fig. 49-52.- Equatorial Degeneration Fig. 53.- Paravascular Attachments Fig. 54.- Angioids Fig. 55, 56.- Pars-Plana Cysts Fig. 57-61.- Vitreous Base Fig. 62-67.- Posterior Vitreous Detachments Fig. 68-70.- Ora serrata Fig. 71-83.- Inflammations Fig. 84-102.- Retinal Detachment Fig. 103-106.- Traumatic Lesions Fig. 107-121.- References.