To see an object, that object must be able to reflect light and the eyes too must be able to receive the light rays. I think to see clearly involves a lot of stages that happen within split seconds. But can I ask you a question, is myopia and presbyopia has to do with the age of eyes?. Also, hyperopia is when light falls behind the retina if I am correct. You have a well written post @rbalzan79
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Hello friend @steepup thank you for your wonderful comment, in general terms we can say that farsightedness occurs due to a short eyeball, ie small, and therefore, a shorter axial length of the norm, however, as in myopia this type of ametropia can develop due to deficient action in the aspect of refractive power of both the cornea and lens.
As for presbyopia, it is related to our age since this causes our natural lenses (cornea and crystalline lens) to lose elasticity and thus refractive power to carry light rays to the retina.
If you are right hyperopia is that the focal point converge behind our retina for the above mentioned, anyway in the bibliographic references of this article are links to other articles related to both myopia and hyperopia.
Thanks for your great contribution to the content developed in this opportunity, greetings.