Blog
The Science of Photochromics: Why Temperature Affects Tint Darkness
Lensmartonline • 2026-02-01 14:28:46
Covers the chemistry of adaptive lenses, temperature's role in performance, and best use cases versus traditional sunglasses.
What Do the Numbers on My Sunglass Frames Mean?
• 2025-12-17 20:51:41
Guide to sunglass frame numbers (e.g., 52-18-140). Learn lens width, bridge, temple length, and how to use them for a great fit. Understand total frame width, PD, & fix common issues.
Oleophobic Coatings: Why High-End Lenses Repel Smudges and Water
Lensmartonline • 2026-02-01 14:29:19
Covers the technology, lab tests for durability, and essential do's and don'ts for maintaining high-end lens coatings.
Decoding Temple Arm Length for a Secure Sunglass Fit
• 2025-12-17 20:51:53
Guide to understanding temple arm length for sunglasses. Learn how to measure for a perfect fit, diagnose issues, and ensure comfortable wear all day.
AR Coating Peeling? Why Hot Water and Soap Ruin Your Lenses
Lensmartonline • 2026-02-01 14:29:38
Covers thermal shock, harsh chemicals, and abrasives that destroy AR coatings, plus a step-by-step safe cleaning and storage method.
How Frame Shape Influences Sunglass Size Perception
• 2025-12-17 20:52:05
This guide debunks the 'eye size' myth, explaining how sunglass frame shape dictates fit, coverage, and style. Learn to choose the right shape for sun protection, high prescriptions, and different nose bridges with confidence.
Free-form Digital Surfacing: Point-by-Point Lens Optimization
Lensmartonline • 2026-02-01 14:29:55
Compares conventional vs. digital lens surfacing, detailing benefits for night driving and why precise PD measurement is critical for results.
Using a Credit Card to Quickly Estimate Your Frame Size
• 2025-12-17 20:52:14
Guide reveals a simple credit card trick to estimate your sunglass frame size. Learn to measure face width, translate to frame dimensions, and troubleshoot common fit issues for confident online ordering.
Why Do Clear Frames Turn Yellow? Materials and UV Degradation
Lensmartonline • 2026-02-01 14:30:15
A detailed look at UV photo-oxidation and chemical reactions causing discoloration, plus daily care routines to keep frames clear.
How Pupillary Distance (PD) Affects Sunglass Sizing
• 2025-12-17 20:52:27
Measurement of pupillary distance (PD) is key for sunglass fit. Learn to measure your PD at home and apply it to frame dimensions for a perfectly tailored look online.
What is the rainbow effect on polarized lenses?
Lensmartonline • 2026-02-01 14:30:36
Explains the science of polarization, screen interactions, and when to use or avoid these lenses.
How to Stop Sports Sunglasses From Fogging Up
• 2025-12-17 20:52:38
Strategies to combat foggy sports sunglasses are detailed within. Understand how airflow, anti-fog coatings, and proper care ensure crystal-clear vision for peak performance.