Vision · Age
To see clearly up close, the crystalline lens — the eye’s internal lens — has to bulge in order to focus. With age it hardens and manages this less and less: this is presbyopia, normal and universal. Vary the age:
The crystalline lens—
Reading a phone at 35 cm
The nearest reading point—
Educational diagram — Dr Moïse Tourabaly, ophthalmologist. For information purposes; it does not replace an examination.