A Simple Guide to the Different Types of Glasses

views

The glasses industry can be overwhelming with diverse types on the market, but once they are broken down into distinct categories, it is much easier to understand. The two main categories are prescription and non-prescription, which then leads into the selection of frames and lenses that are most suitable, based on the need for the glasses.

Prescription Glasses 

Prescription glasses require a professional eye examination to identify weaknesses:

The types of prescription glasses include:

  • Single vision – effective at correcting one optical problem 
  • Bifocal – effective at correcting two optical problems at once 
  • Trifocal – effective at correcting three optical problems at once
  • Progressive – like bifocal and trifocal lenses, but with a smoother transition between segments

Prescription glasses are used to correct the following vision problems:

  • Nearsightedness (myopia) – objects far away appear blurry when the lens becomes too curved to refract light correctly
  • Farsightedness (hyperopia) – objects nearby appear blurry when the lens becomes too flat to refract light correctly
  • Astigmatism – objects or nearby can appear blurry due to imperfection in the curvature of the cornea, or mismatched curvature of the lens

Non-Prescription Glasses 

Non-prescription glasses do not always require an eye examination to identify weaknesses and can be bought over the counter:

  • Reading –  glasses intended to prevent eyestrain when focusing on writing
  • Blue Light – lenses specifically designed to filter blue light to reduce exposure when using digital screens (you can browse these on Just-glasses.co.uk)
  • Safety – protective glasses used by professionals to protect their eyes from harmful environments
  • Sunglasses – with polarized and UV blocking lenses, to protect eyes from the sun

Lenses

There a variety of materials used in creating lenses with varying levels of quality and features, including:

  • Glass – high quality but less durable
  • Plastic – produces comparable results to glass but cost less and are more durable
  • High-Index Plastic – one of the thinnest and lightest lens available
  • Polycarbonate – commonly used in safety goggles and children’s eyewear due to durability
  • Trivex – similarly to polycarbonate, a durable option, suitable for protecting the eyes from harm
  • Aspheric – high quality, flat and thin, beneficial for stronger prescriptions 
  • High Definition – more expensive than most other options but provides outstanding quality
  • Photochromatic – also known as ‘transition’ lenses, they act as sunglasses by dimming when exposed to UV rays
  • Scratch-Resistant Coating – finished with a protective coating to reduce damage, increasing durability
  • Anti-Reflective Coating – also known as ‘anti-glare’ lenses, they make driving, reading, and using screens easier by eliminating reflections 
  • Anti-Fog Coating – reduces the amount of fogging when switching from colder to warmer climates
  • UV Blocking – finished with a UV blocking dye, they reduce health risks associated with exposure to UV rays

Frames

The most common materials used in making frames are:

  • Plastic – using zylonite, nylon blends and castor seed oil, providing more color variation with lower cost
  • Metal – using monel, titanium, beryllium, stainless steel, flexon and aluminum, offers more durability but fewer colors
  • Wood – using bamboo provides an environmentally friendly and sustainable alternative but it’s high maintenance and not ideal in humid climates 

All frames fit within the three categories:

  • Full Frame – fully outline the lens
  • Semi-Rimless – partially outline the lens
  • Rimless – frame-free lens

Within these categories of frames, comes a range of styles:

  • Rectangle – standard rectangular shaped glasses
  • Browline – rimless at the bottom, outlined at the top
  • Cat-Eye – accentuated with a feline form
  • Round – circular shape, leaning towards a retro feel

There are many types of glasses, lenses, and frames to choose from, depending on your personal needs and preferences. For prescription glasses, it is necessary to register with an eye doctor for an examination. This will help to identify any optical problems that require treatment with corrective lenses. Glasses for reading, blue light, or sun blocking, can be bought over the counter or online.

Share this
Tags

Must Read

Decoding Slot Symbols: Understanding Wilds, Scatters, and Multipliers

Slot machines are not only about spinning reels and matching symbols; they also feature special symbols that can significantly impact gameplay and increase your...

The Mystery of Scatter Symbols: Your Gateway to Free Spins

In the world of online slots, symbols play a pivotal role in determining the outcome of the game. Among these symbols, the scatter symbol...

Mastering the Markets: Advanced AI Trading Strategies

In the ever-evolving world of trading, technology continually reshapes the landscape. Today, one of the most influential advancements is the application of Artificial Intelligence...

Must-read

How Was Beer Made in the 18TH Century?

Imagine you're a brewer in the 18th century, tasked with turning simple ingredients into a satisfying pint. You'd start with barley, soaking and germinating it before drying it in a kiln to preserve essential enzymes. Next, you'd mash the malted barley in hot water to extract the sugars, setting the stage for fermentation. Boiling the wort with hops would add...

Adolphus Busch: The Visionary Behind Beer Powerhouse Anheuser-Busch

Adolphus Busch was born on July 10, 1839, in Kastel, Germany, and later immigrated to the United States in 1857. His journey to becoming a brewing magnate began when he joined the E. Anheuser & Co. brewery in St. Louis, Missouri, which was owned by his father-in-law, Eberhard Anheuser. With a keen business acumen and innovative spirit, Busch quickly...

The Story Behind the Famous “King of Beers” Slogan for Budweiser

Budweiser is a prominent name in the beer industry, known for its iconic slogan "King of Beers." This slogan has an interesting history that reflects the brand's journey in the United States. German immigrant Adolphus Busch arrived in the country in 1857 and later married Lilly Anheuser. He began working at his father-in-law's brewery, which would eventually become Anheuser-Busch. By...

Recent articles

More like this