Why Are Prescription Lenses Used And When?

When a person realizes that they need glasses, they can pick a pair off the shelves and buy the glasses. In some instances, the glasses may not be sufficient to correct the visual impairment. In this case, Prescription Lenses may be required. HP echo prescription lenses can only be given to patients following an eye exam performed by an optician or optometrist. 

They determine if your vision impairment is the point that the patient requires an individual prescription that meets their requirements and possibly solves their specific vision issues.

When formulating a prescription for lenses an optometrist or optician will take into account not just the physical condition of the eyes, but also the power of the person's close as well as distance vision. 

The individual's unique physiognomy with regards to their eyes like the distance between their cornea and lens is additionally considered to make an individual prescription.

There are a variety of manufacturers of prescription lenses that can make lenses that meet nearly every need of any person because no two eyes are alike. 

For example, bifocal lenses combine reading and distance distances into one lens that has a dividing line. 

Varifocal lenses, also known as progressive or progressive, in contrast, are like bifocals in that they allow users to view both short and long distances. But, unlike bifocals, they don't have a separation line since they blend the prescriptions into one lens.