If you’re someone who wears glasses, you’ve probably heard of progressive lenses – lenses that have multiple prescriptions in one lens. These lenses are popular among people who have trouble seeing objects up close and far away. However, not all progressive lenses are created equal. To ensure you’re getting the right progressive lenses, it’s important to understand what the symbols on them mean. That’s where progressive lens identifier symbols come in.
What are progressive lens identifier symbols?
Progressive lens identifier symbols are a series of markings that are etched onto the lens. These markings tell the optician or optometrist the specific design and manufacturer of the lens. The symbols are typically located on the side of the lens, and are usually small and difficult to see with the naked eye.
Why are progressive lens identifier symbols important?
Progressive lens identifier symbols are important because they help ensure that you’re getting the right lenses. Different progressive lenses have different designs and characteristics, and the symbols on the lens will tell your eye care professional which design you have. This is important because the wrong lenses can cause eye strain, headaches, and difficulty seeing.
What do the symbols mean?
There are several different symbols that can appear on progressive lenses. Here are some of the most common:
- ADD: This stands for “add power,” and refers to the additional magnifying power that is added to the bottom of the lens to help with reading and close-up work.
- PD: This stands for “pupil distance,” and refers to the distance between the center of each pupil. This measurement is important for ensuring that the progressive lens is positioned correctly on the eye.
- Manufacturer’s name or logo: This symbol indicates the manufacturer of the lens.
- Design name or code: This symbol indicates the specific design of the lens.
- Segment height: This symbol indicates the height of the progressive lens segment, which is where the magnifying power changes from distance to reading.
How to read progressive lens identifier symbols
Reading progressive lens identifier symbols can be tricky, but it’s important to understand what they mean. Here’s a quick guide:
- Look for the symbol that indicates the manufacturer of the lens.
- Look for the symbol that indicates the specific design of the lens.
- Look for the symbol that indicates the ADD power.
- Look for the symbol that indicates the segment height.
- Make sure the PD measurement is correct.
In conclusion, understanding progressive lens identifier symbols is important for ensuring that you’re getting the right lenses. By knowing what the symbols mean and how to read them, you can make sure that your progressive lenses are the right fit for your eyes. If you have any questions about progressive lenses or the symbols on them, be sure to talk to your eye care professional.