TOKAI OPTICAL CO., LTD. receives a wide range of inquires about eyeglass lenses from various people. Many of these inquires relate to “Absorptive Lens,” which are attracting a particularly high interest.
Major questions are as follows:
- What lens color suits me?
- What lens color should I select?
- Can I select a lens color that I like?
- Are lens colors to select different depending on eye diseases?
- I am concerned about whether I can select a correct lens color.
- Can’t I buy light-shielding lenses without a doctor’s prescription?
This time, we select some from among many questions related to light-shielding lenses. We hope that they will be helpful to those who have similar questions.
About Absorptive Lens
“Absorptive Lens” are very effective tinted lenses (sunglasses) for those who feel glare. However, glare (photophobia) is different from person to person, and so is its intensity. Even if individuals suffer “eye diseases” with the same symptoms, the intensity of glare they feel, and the visibility of things due to glare may be different between them. TOKAI OPTICAL CO., LTD.’s Absorptive Lens are available in 26 colors to support various symptoms.
Trial Kit
What is used first to determine the color fit for your visibility from among the 26 colors is a “Trial Kit.”
Use a 26-color Trial Kit when selecting the color of Absorptive Lens. The following two types of Trial Kits are available. The differences between these types and the features of each type are explained below.
Type 1: STG Full Trial Kit (bar type)
Try oblong sheet type color samples by holding them over the eyes.
This type of Trial Kit is used by various facilities because various colors can be compared one by one.
It is characterized by easy color switching and instantaneous perception of the difference in visibility.
Type 2: STG Test Lens Kit (trial lens type)
Try lenses by fitting them in a trial frame.
You can try them with corrected eyesight by using them together with lenses of prescription power.
Since both hands are free, you can check safety while walking with a white walking stick in a hand.
Frequently asked questions
Some questions are shown in a question-and-answer format below.
Q1: How do I select the color of Absorptive Lens?
A1: You select the color of Absorptive Lens by checking visibility using a Trial Kit and with the support of an inspector. If you need Absorptive Lens to protect your eyes from glare when you go out, you try lens colors outdoors on a fine day; or if you need Absorptive Lens to protect your eyes from indoor LED lights, personal computer, or smartphone, you try lens colors in a place where similar light is used. Or, if you need Absorptive Lens against the lights of oncoming cars or street lights in the nighttime, you check visibility on the street in the evening or later hours. In general, the color of Absorptive Lens is determined based on the preference, etc. of the person who receives an inspection, but it is advisable not to select a favorite color but to preferentially select a color with which a better effect can be felt.
If you want to learn more about how to select colors of Absorptive Lens, access the following page:
Vol.11 How to select colors of Absorptive Lens, and points to note about selection
Q2: Do eyeglasses for personal computers and Absorptive Lens have the same blue light cutoff function or effect?
A2: Absorptive Lens are filter lenses, which effectively suppress light with a short wavelength of 500 nm or less, including blue light and ultraviolet rays in sunlight, and alleviate glare while allowing bright light to pass through them. With this effect, Absorptive Lens prevent vision from becoming excessively dark like sunglasses, and suppress glare.
On the other hand, eyeglasses for personal computers are explicitly tailored to suppress blue light emitted from digital devices. They come in coated and tinted types, and the blue light cutoff rate is also different between them.
Absorptive Lens are available in various situations, whereas eyeglasses for personal computers are designed exclusively to protect eyes from blue light emitted from digital devices. There are also colors of Absorptive Lens favorable for use when operating a personal computer. Recommended colors are grayish and greenish colors, which less change in color tone, and brownish colors, which increase contrast.
It is not necessarily true that a high blue light cutoff rate is good, and it is important to select a color with usefulness and visibility for the user taken into account.
Q3: Can Absorptive Lens be made with progressive lenses?
A3: Absorptive Lens support the latest bifocal lenses, progressive lenses, wide vision lenses for near vision, etc. Use appropriate lenses according to the purpose of use or the environment where they are used.
Q4: What is the difference between Absorptive Lens and color vision correction lenses?
A4: Color vision correction lenses are tinted lenses designed to correct the imbalance of the three primary colors of light, which occurs to people with color vision variation, so that they can feel the three colors with the same balance. Absorptive Lens are recommended to all people who feel glare, and developed with the aim of effectively blocking short-wavelength light and improving contrast.
We hope that the abovementioned information and advice will be helpful to those who have questions about Absorptive Lens.
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