To prevent the eyes from being damaged by the harsh summer sunlight, it is essential to choose a suitable pair of sunglasses. Especially for myopic individuals, wearing low-quality sunglasses not only fails to protect the eyes but may cause greater harm, so caution is advised when purchasing.
For myopic people who want to wear sunglasses, the following methods are available:
Contact lenses + sunglasses: This is not applicable to the main scenario mentioned here, so it will not be elaborated on.
Polarized clip-ons: Convenient but unsightly. They are uncomfortable to wear and prone to loosening.
Dyed myopic sunglasses: Lenses dyed in ordinary stores are prone to color fading and scratching and have a short lifespan. Lenses pre-dyed by professional lenses manufacturers have more stable colors but are relatively expensive.
Magnet-on sunglasses: More stable than clip-ons but heavier. Frequent removal and wearing can easily cause scratches on the sunglasses lenses.
Myopic polarized sunglasses: Highly functional.
Sunlight reflecting off water, snow, or roads creates glare, often causing eye discomfort and fatigue. Polarized sunglasses can effectively filter out these irregular reflected lights, making surrounding scenery appear soft and non-glare. Especially for drivers, anglers, and sports enthusiasts, it is recommended to wear myopic polarized sunglasses. Even for those who do not exercise frequently, purchasing them is cost-effective—they are lighter, more stylish, and have a longer lifespan than other methods.
Shortcoming: If the myopia diopters is high, the lenses will be thicker. Within 800 Diopters, it is still feasible. Of course, MR-8 lenses with a refractive index of 1.6 can be used, which are much thinner but slightly more expensive.
Common sense about optical frame fitting:
Diopters:
The diopter of a lens, commonly known as “degree,” is the most important parameter of a lens.
Thickness is basically proportional to diopter, but there are ways to reduce lens thickness.
Refractive index:
The refractive index is the ratio of the speed of light in a vacuum to its speed in the material.
For the same degree, a higher refractive index means thinner, lighter, and more aesthetically pleasing lenses, but the price is also higher. However, a higher refractive index is not always better, which relates to the lens’ Abbe number.
Abbe number:
Different colors of light have different refractive indices in a medium. When refracted by a lens, the propagation directions of light differ, causing sunlight (composed of polychromatic light) to disperse into different colors—a phenomenon called chromatic aberration. Chromatic aberration affects visual clarity.
The Abbe number measures the degree of chromatic aberration. A higher Abbe number means less chromatic aberration, and vice versa.
Generally, a higher refractive index corresponds to a lower Abbe number and more severe chromatic aberration.
Therefore, when choosing lenses, do not blindly pursue a high refractive index—it not only increases costs but also reduces visual clarity. In general, the refractive index should be selected based on the degree:
Below 200 Diopters: Choose 1.50 refractive index myopic lenses.
200–400 Diopters: Choose 1.50 or 1.56 refractive index myopic lenses.
400–600 Diopters: Choose 1.60 refractive index myopic lenses.
600–800 Diopters: Choose 1.67 refractive index myopic lenses.
Above 800 Diopters: Choose 1.74 refractive index myopic lenses.
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