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- W2494796782 abstract "For measuring visual acuity, a patient should read the Snellen chart from 20 ft with the left eye occluded first and take the vision in each eye without and then with spectacles. Vision is expressed in a fraction-like form. The top number is the distance in feet at which the patient reads the Snellen chart. The bottom number is the size of the object seen at that distance. The chapter discusses the most common refractive and non-refractive errors, including emmetropia and ametropia. It also explains how to fix the lenses to correct the optical defects of the eye and uses of contact lenses. The chapter then provides three newer surgery procedures, laser in situ keratomileusis (LASIK), photorefractive keratectomy (PRK), and epi-LASIK, to correct myopia, hyperopia, and astigmatism by utilizing an excimer laser to remove corneal stroma." @default.
- W2494796782 created "2016-08-23" @default.
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- W2494796782 date "2016-05-06" @default.
- W2494796782 modified "2023-09-25" @default.
- W2494796782 title "Measurement of Vision and Refraction" @default.
- W2494796782 doi "https://doi.org/10.1002/9781119243649.ch2" @default.
- W2494796782 hasPublicationYear "2016" @default.
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