Difference in Bifocal, Progressive & Reading Glasses

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People with presbyopia find progressives lens comfortable than bifocals or reading glasses and get natural vision and a youthful appearance.

More often people are little bit unsure of the difference between bifocals, progressives & reading glasses.

Bifocals:

A bifocal lens is created with two different areas of vision correction, which are divided by a distinct line that sits horizontally across the lens. Bifocals are glasses that have both a correction for your distance vision and near vision. The top portion of the lens is used for distance, while the bottom portion of the lens is used for closer vision. As a bifocal wearer lowers his eyes downward to read, he sees through the near-vision portion of the lens.Regular bifocals are flat-top 28. This means that the reading portion of the lens is 28-millimeters wide and shaped like a sideways “D”. The lens segment devoted to near-vision correction can be one of several shapes:

  • A half-moon — also called a flat-top, straight-top or D segment
  • A round segment
  • A narrow rectangular area, known as a ribbon segment
  • The full bottom half of a bifocal lens, called the Franklin, Executive style

bifocals

 

 

 

 

 

Progressive Lenses:

Progressive Lenses look exactly like single vision lenses and are the most exciting and technologically advanced spectacle lenses available offering smooth, continuous vision at near, middle and distant focal ranges, with no lines or unsettling image jumps.

progressive lensesProgressive lenses are far more sophisticated and technologically advanced; providing a more natural correction of presbyopia than bifocals or trifocals as there is a seamless progression from distance to near with an intermediate section in between. Progressives eliminate a problem called “image jump” which is experienced with bifocal and trifocal lenses, as the lines on the lenses create a drastic change in power which causes images to appear to jump as you move from distance to near.

Progressives create a smooth and comfortable transition from distance to near and back.With progressive lenses,you can see clearly across the room or on the road while driving or look ahead to see your computer or someone sitting in front of you through the intermediate section. Lowering your eyes downward, you can read fine print comfortably through the bottom part of the lens.

 

Reading Glasses:

reading glassesReading Glasses are Single vision lenses used to correct the near vision and help you to read clearly. When a person reaches a stage where he/shebeenable to read the close materials at arms distance, theyshould consider reading glasses.

 

Reading glasses have mainly two styles: full frames, where entire lens is made in the reading prescription, and the other is half-eyes, these are smaller style glasses that sit lower down on the nose.People spending more hours on close material should opt for Full reading glasses but whenyou look across the room through the reading lenses, everything will appear blurry.Whereas, half-eye reading glasses allow you to look through the lenses for near work and up and over them to see in the distance.

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On January 21, 2016
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