presbyopia
The gradual loss of the eyes' ability to focus on nearby objects, typically occurring as a natural part of the aging process due to the hardening of the lens.
Noun
This term describes a physiological decline in ocular flexibility rather than a disease of the retina or cornea. It carries a clinical, neutral connotation, typically used in medical diagnoses or optometry consultations to explain why a person can no longer read small print without assistance.
As a medical condition referring to a specific biological state, the word is treated as an uncountable noun. It does not have a plural form in standard usage, as it describes a general condition of the lens rather than individual instances of the ailment.