PubMed · 5566541
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H Munker, H Schober. 1971-01-31. [Protective glasses].. https://pubmed.ncbi.nlm.nih.gov/5566541/
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In this article product developments for ophthalmic lenses are discussed: new materials, designs and coatings. High-index plastic substrates allow to offer corrections which are simultaneously light and thin and for the first time there are high performant plastic photochromic lenses. Head and eye movements with latest generation's progressives are very similar to natural vision behaviour. Special aspheric designs have been developed for comfortable vision for near and intermediate distances. Finally there are new coatings which protect the high quality surfaces of plastic lenses distinctly longer than before.
PURPOSE: To introduce the concept of the ray vector field and apply it to a problem in ophthalmic optics. METHODS: Matrix and linear algebra are used to relate ray vector fields and a representation of thin spherocylindrical lenses. RESULTS: Equations were derived relating ray vector fields and a particular coordinate system recommended previously. The method is illustrated with a simple example from ophthalmic optics, namely, addition of spherocylindrical lenses. We also illustrate the method by considering two spherocylinders separated by a distance. CONCLUSIONS: Ray vector fields are intuitively simple and can be used to solve complex ophthalmic optics problems.
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