Lenses

Single vision lenses have one consistent prescription across the entire lens surface.

They're designed to correct vision at a single distance, either for near or far vision.

These lenses are commonly used to address nearsightedness, farsightedness, or astigmatism.

Unlike multifocal lenses, they don't have different zones for varying distances.

Essentially, they provide a clear, focused image for one specific visual need.

Bifocals are eyeglasses with two distinct prescription areas in one lens.

The top part of the lens corrects your distance vision, so you can see far away clearly.

The bottom part of the lens corrects your near vision, making it easier to read or see things up close.

You can usually see a visible line separating these two prescription zones.

Essentially, bifocals provide a convenient way to see both near and far without needing two separate pairs of glasses.

Progressive lenses are a type of multifocal lens that corrects vision at all distances.

Unlike bifocals, they don't have a visible line separating the different prescriptions.

Instead, the lens power gradually changes from top to bottom, allowing for clear vision at distance, intermediate, and near ranges.

This smooth transition provides a more natural viewing experience.

Essentially, progressive lenses offer a seamless way to see clearly at any distance without needing multiple pairs of glasses.