Question

causes and correction of presbyopia

Answer 1

when person get old, their ciliary muscle looses ability to make the lense thick or thin. That's why, they can not able to see properly.
It can be correct by using bifocal lense.

Answer 2

Hey mate,

What Is Presbyopia?

- Presbyopiais an eye condition in which your eye slowly loses the ability to focus quickly on objects that are close. 

Causes of Presbyopia

- With age, your lens and the muscle fibers surrounding your lens slowly lose flexibility and stiffen.
- As a result, your lens becomes unable to change shape and constricts to focus on close images.
- With this hardening of your lens, your eye gradually loses its ability to focus light directly onto your retina.

Correction of Presbyopia

- You might be able to use nonprescription reading glasses. They are best for reading close.
- You’ll need prescription lenses for presbyopia if you can’t find an appropriate magnification from the nonprescription offerings
- Conductive keratoplasty (CK) involves using radiofrequency energy to change the curvature of your cornea. 
- Laser-assisted in-situ keratomileusis (LASIK) can be used to create monovision.

hope this helps you out!