Spectacle Lens Powers
Spectacle Lens Powers Gregory L. Stephens Darryl J. Meister1 The authors would like to acknowledge the contributions of the late John K. Davis to chapters 51 A-D. John was an…
The Human Eye as an Optical System
The Human Eye as an Optical System Milton Katz Philip B. Kruger Introduction The eye is a compound optical system composed of a cornea and a lens shown in Figure…
Geometrical Optics
Geometrical Optics Edmond H. Thall The discipline of geometrical optics deals with image formation by optical instruments. Physical optics (see elsewhere in these volumes) deals with the nature of light…
Aspheric Lenses
Aspheric Lenses David Volk A spherical refracting surface is of constant curvature, ie, it has a specific radius of curvature. Any ophthalmic refracting surface other than a spherical refracting surface…
Theory and Practice of Spectacle Correction of Aniseikonia
Theory and Practice of Spectacle Correction of Aniseikonia Eleanore Z. Thill Aniseikonia, a term coined by Dr Walter Lancaster in 1932, is an anomaly of binocular vision in which the…
Video-Based Low-Vision Devices
Video-Based Low-Vision Devices Jennie Y. Kageyama Joseph L. Demer Steven D. Schwartz Melissa W. Chun Low-vision devices, whether optical or video based, facilitate visual function and mitigate limitations due to…
Vision Rehabilitation
Vision Rehabilitation Joel A. Kraut Low vision is increasingly a problem in our society today and will continue to be so in the future.1 Low vision refers to a range…
The Cross Cylinder
The Cross Cylinder Stuart E. Wunsh The invention of the cross cylinder can be traced back to the early 19th century. In 1837, the astronomer Sir George Biddle Airy1 made…
