LIBROS DEL AUTOR: george frederick helm

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  • Short Sight, Long Sight And Astigmatism
    George Frederick Helm
    Short Sight, Long Sight And Astigmatism: An Elementary Guide To The Refraction Of The Eye is a comprehensive guide to the science of eye refraction, written by George Frederick Helm and first published in 1886. The book covers the three most common types of refractive errors: myopia (short-sightedness), hyperopia (long-sightedness) and astigmatism. It provides a detailed explan...
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    25,89 €