What is Presbyopia?
Presbyopia is a condition that limits the focusing power of your eye as you age.
It affects every human being and cannot be reversed but in all cases can be helped by using reading glasses.
Typically people become aware in their early forties when their near sight becomes blurry or by suffering from asthenopic symptoms of eyestrain such as tension and headaches.
What Causes Presbyopia?
The crystalline lens inside the eye stiffens and is less able to flex to adjust your focus. The lens is made up of an outer capsule, with cells inside that which divide multiply and grow throughout your entire life. It is thought that this continual growth eventually causes the problem.
The lens becomes so densely packed with cells, stiffening over time and reducing its ability to flex and focus like it did in your youth.
What Age Will I Need Reading Glasses?
The vast majority of people require reading glasses during their mid-forties but individual variations and activities determine when each individual needs them.
Most will start to wear glasses for more concentrated tasks at first and then begin to use them more often.
Do Glasses Make My Eyes Worse?
Presbyopia continues to progress further reducing the focusing ability and therefore the power of the glasses needs to increase to counteract the loss. But as human beings we never hold ourselves responsible, IT MUST BE THE GLASSES FAULT!
The chart below shows how your amplitude of focus reduces over time, predictably for the average human eye.
Is The Need For Reading Glasses Predictable?
The chart above shows a very predictable pattern of the loss in focussing power as we age. The average person will need to use reading glasses occasionally for near tasks like reading, using mobile phones and computer work throughout their 40s.
By the time most people reach their 50s, they will be using glasses for reading and most near task all the time.
Once we reach our 60s many people opt for multifocal glasses such as bifocal or varifocals so that they don't have to keep taking them off all the time.