In an eye prescription, PG refers to a type of lens that offers continuous vision across multiple distances.
According to the provided reference, a PG lens is designed to give you continuous vision at a distance, intermediated, and near focal ranges with no image jumps or lines. This contrasts with older lens types that might have distinct lines separating vision areas.
What Are PG Lenses?
A PG lens provides a seamless transition between different viewing distances. Instead of having separate segments for near, intermediate, and far vision, the power of the lens gradually changes from the top (distance) to the bottom (near).
This design means you can look straight ahead for clear distance vision, glance slightly down for intermediate vision (like a computer screen), and look further down for near vision (like reading a book), all through the same lens without noticeable shifts or lines.
Benefits of PG Lenses
Based on the characteristics described, the benefits of choosing PG lenses include:
- Continuous Vision: Experience smooth, uninterrupted sight across all focal lengths.
- Multiple Focal Ranges: Clear vision for distance, intermediate, and near tasks.
- Aesthetic Appeal: No visible lines on the lenses, offering a more youthful look compared to bifocals or trifocals.
- No Image Jumps: The gradual power change eliminates the disorienting "image jump" effect often associated with lined lenses when shifting focus between distances.
Cost Consideration
The reference notes that this type of prescription lens is generally more expensive than bifocals. However, it also suggests that the enhanced visual experience and convenience may make it a worthwhile investment for many individuals.
PG Lenses vs. Bifocals
Here's a simple comparison based on the information provided and implied:
| Feature | PG Lenses (Progressive) | Bifocal Lenses |
|---|---|---|
| Vision Type | Continuous vision (distance, intermediate, near) | Two distinct vision areas (distance, near) |
| Image Transition | No image jumps or lines, smooth transition | Has a visible line, image jumps possible |
| Intermediate Vision | Included in the continuous range | Generally not included |
| Cost | More expensive | Less expensive |
In summary, while "PG" itself is likely an internal code or specific term, the description provided perfectly matches the characteristics of Progressive Lenses, which offer a modern, line-free solution for individuals needing vision correction at multiple distances.
