XLV. On refraction

Xlv Kzm Zakopane 2016

Hints on Refraction

This is an excellent little guide to sight testing by Dr. S. K. G-anguly, Assistant at the Eye Infirmary of the Medical College, Calcutta. It is a very practical little book?concise, correct, and clear. Each section or chapter is devoted to description with methods of procedure and illustrative examples. The difficult subject of astigmatism is clearly explained, and the methods for correction d...

Xlv. Note on Urinary Tides and Excretory Rhythm

Steiger on refraction: a reappraisal.

Seventy years ago Steiger, a Swiss ophthalmologist, found the distribution of corneal powers to follow a normal (binomial) curve. He noted a wide range of values among emmetropes, and he also knew that their axial lengths varied significantly. He expected that normal distributions would be found for other components of refraction and also for refraction as a whole, and in seeking a controlling ...

Coherent perfect nanoabsorbers based on negative refraction.

Based on both analytical dipole model analyses and numerical simulations, we propose a concept of coherent perfect nanoabsorbers (CPNAs) for divergent beams. This concept makes use of the properties of a slab with negative refraction and small losses. The proposed CPNA device would allow focusing radiation in nanoscale regions, and hence could be applied in optical nanodevices for such diverse ...