வெள்ளெழுத்து -காரணங்கள், அறிகுறிகள் - Presbyopia Causes, Symptoms

Presbyopia - Causes, Symptoms 

Presbyopia is the normal loss of near focusing ability that 

occurs with age. Most people begin to notice the effects of 

presbyopia sometime after age 40, when they start 

having trouble seeing small print clearly — including text messages on their phone.

Presbyopia - Causes

Presbyopia is an age-related process. It is a gradual thickening 

and loss of flexibility of the natural lens inside your eye.

These age-related changes occur within the proteins in the lens, 

making the lens harder and less elastic over time. Age-related 

changes also take place in the muscle fibers surrounding the lens. 

With less elasticity, it gets difficult for the eyes to focus on 

close objects.