explain the following term used in relation to defect of vision and correction provided for then (i)presbyopia (ii)bifocal lenses (iii)hypermetropia
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1)presbyopia-Presbyopia is the gradual loss of your eyes' ability to focus on nearby objects. It's a natural, often annoying part of ageing.
(2)bifocal lenses-Bifocal contact lenses are a type of multifocal contacts that correct both presbyopia and your other refractive error. These contacts have different zones with different powers that allow you to focus on several ranges.
3)hypermetropia-Hypermetropia is an eye problem where a person has difficulty viewing objects close to him, but can clearly see the objects located far away. This happens due to the light being focussed behind the retina instead of being focused on it. This condition is also known as far-sightedness, long-sightedness or hyperopia.
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