The Anatomy of Safety Glasses

Your eyes are one of the most vulnerable parts of your body, which is why safety glasses are so essential when working in a hazardous industry or participating in an activity or sport that can result in an eye injury. Learn about the different types of safety eyewear and common features.

Types of Safety Eyewear

Whether you are purchasing safety eyewear for your job, a sport, or for use at home, there are several different types to consider that offer varying levels of protection depending on the task at hand.

Safety Spectacles

Safety spectacles can be prescription or nonprescription and feature polycarbonate lenses paired with durable frames. This type of eyewear may be equipped with either vented or unvented side shields and other features such as gaskets and nose or temple pads.

Safety Goggles

Safety goggles are the other main type of eyewear often used in situations where a more secure seal to the face is required. Goggles may be either direct vented, indirect vented, or non-vented. Direct vented goggles have several holes located throughout the top or side of the goggles, which are small enough that they block any object bigger than 1.5 mm in diameter. While they can help prevent fogging, these goggles do not protect against liquid splashes. Indirect ventilation uses angled, rear-facing holes that are often adjustable. This system protects the eyes from chemicals but does not provide the same level of ventilation as direct vented goggles. Non-vented goggles provide the highest level of protection but are prone to fogging.

Features of Safety Glasses

When considering safety spectacles, there are several features that are an essential part of every pair of PPE and others that are only integrated into some types of eyewear:

Polycarbonate Lenses

Glasses designed for safety purposes most often feature polycarbonate lenses, which provide superior impact-resistance qualities. This material does not shatter when hit or dropped, and they can withstand extremely hot temperatures and provide 100% UV protection. The lenses are made using the injection molding process, and they are incredibly lightweight and thin. Lenses come in a variety of colors and tints depending on the lighting conditions. Many people also opt for photochromic or polarized lenses and add anti-scratch, anti-reflective, or anti-fog coatings.

Side Shields

For glasses with a 6-base curve, side shields are added to provide adequate protection to the sides of the eyes. Without them, it is very easy for dust, liquids, and UV rays to enter. While many glasses designed specifically for industrial use already have this feature built into the frames, some people prefer removable side shields.

Gaskets and Nose or Temple Pads

Gaskets give spectacles a goggle-like seal, preventing dust and particles from entering the eye. However, they are not ideal for use with chemicals. Nose or temple pads can also provide a better fit to face, preventing slipping when moving or sweating.