As humans, vision is an important sense that our lives rely on, and clear vision is what we have always pursued. But when did lenses appear in our lives, and what is the history behind lens technology? While my early frames felt clunky and simple, today's lenses are thinner, lighter, and can even correct problems like astigmatism that would have been unimaginable just a few decades ago. I started to wonder - how did we get from the original pair of lenses to the high-tech innovations we have today? Let’s take a look at some of the key developments over the centuries that brought clarity to the lives of many people.

Eyeglasses have become an essential tool for many individuals, helping to correct vision problems and improve overall visual clarity. One crucial component of eyeglasses is the lenses, which come in various types and designs to meet different vision needs. In this blog, we will explore the basics of eyeglass lenses, shedding light on their functions, types, and how they can enhance our daily lives.

We may find marks on the progressive glasses purchased, and some even think that are the defects of the lenses. Theses marks appears as circles, letters, and numbers as shown in the picture below.

1. Bifocals help you get far and near vision only, and will generate image jumps when you look near after you see distance. 2. You will get continuous vision at distant, middle, and near focal ranges with progressive lens, and with no lines, no annoying image jumps. 3. progressive lens will be more expensive than bifocals. But the extra price is worthy of its value.

Bifocals are dual-version glasses, you can see two different fields of vision through one pair of bifocal glasses. Bifocals are designed with two prescirptions on the lenses, so you can see far through the top part of the lenses, and reading book or use computer through the bottom part of the lenses.

Progressives provide a smooth transition from distance through intermediate to near, with all the in-between corrections included as well. You can look up to see anything in the distance, look ahead to view your computer in the intermediate zone, and drop your gaze downward to read and do fine work comfortably in the close zone. That’s to say, progressive lenses are the closest to how natural vision is that you can get in a pair of prescription eyeglasses.