Many people are confused by the vision problem named presbyopia.
It is bothersome that why this condition will inevitably occur when a person reaches about 40.
These people are reluctant to experience visual changes due to presbyopia.
Most people notice presbyopia at around 40 years old.
Individuals suffering from this eye condition usually have some signs or symptoms.
They always hold things such as handwritten items, sewing and newspapers at a length's distance.
Only in this way can they see these objects clearly.
Presbyopic people also have difficulty reading in poor light conditions.
It is also hard for them to see small detail or print.
Serious cases include headaches or tired eyes after long-time reading.
Natural aging is exactly the cause of presbyopia.
The natural lens of the eye continues to develop and young adults always have great lens flexibility.
However, this flexibility gradually decreases as people age.
As a result, a person reaching a certain age needs prescription lens for detail reading.
This process is inevitable for everyone.
Reading glasses are widely used for those presbyopic people without a distance prescription.
These glasses perform well in close materials reading.
Reading glasses come in ready-made and custom-made types.
It is quite necessary to get a right prescription when a person wants to buy ready-made reading glasses.
Reading glasses have a shortcoming that they can only help in close reading.
What's worse, this type of glasses usually causes blurry vision in distance objects.
In this consideration, varifocal lenses are created to meet one's needs for both far and near vision.
Varifocal lenses provide three powers within a lens.
With this kind of lenses, wearers are allowed to properly focus on everything at distance, middle distance or close up.
Another type of multifunctional glasses is bifocals, which have both a reading and distance prescription.
Bifocal glasses are incompetent for computer work, because they do not have a middle distance prescription.
In similar, dashboard in the car is also beyond bifocal lenses.
Multifocal contact lenses in various types are also helpful in addressing presbyopia.
Contact lenses can be combined with monovision.