Physics 9.07 How do glasses work? Ametropias of the eye: myopia, hyperopia, presbyopia, astigmatism.

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Física Explicada

Published on Apr 30, 2024
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We explain how the human eye works and its most important parts as an optical system: cornea, lens and retina. The lens has the ability to accommodate, adapting its convergence to focus on objects that are closer or further away. If the far point does not reach infinity, the eye is myopic and needs to be corrected with diverging lenses. If, on the other hand, the eye has a deficit of convergence, the eye is hyperopic and needs to be corrected with convergent lenses. If the near point is too far away, the problem is presbyopia. We also describe astigmatism, which is corrected with cylindrical lenses. Finally, we discuss how diopters relate to the focal length of the lenses of our glasses. -Easy question: If the optometrist tells you that you have -4 diopters, what focal length do your glasses have? -Normal question: If the diameter of our eyeball is approximately 1.8 cm, calculate the power of our cornea-lens system when we focus on objects 40 cm away.

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