iPhone17 Eye Protection Film Recommendation: A Complete Purchasing Guide from Light Transmittance to Reflectance

I. Why are light transmittance and reflectance the core considerations when making a purchase?

Most people first look at the hardness and thickness when buying a film, but the impact of these two parameters on the daily viewing experience is far less direct than that of light transmittance and reflectance.

First, insufficient light transmission will force the eyes to "look hard".Transmittance is the proportion of light retained after passing through the film layer. If the light transmittance of a film is only around 90%, it means that the screen brightness has been reduced by nearly 10% by the film layer. To see the content clearly, users often manually brighten the screen, but this brings a higher brightness stimulus. The lower the light transmittance, the greater the effort the eyes need to make to recognize. Only a film with a light transmittance close to that of the bare screen can ensure that there is no need to increase the brightness after applying the film.

Second, excessively high reflectivity will superimpose a "light curtain" on the picture.The reflectivity of ordinary tempered film is approximately 4%, and it will form a visible mirror-like reflection under the light or by the window. The eyes are forced to analyze both the picture and the reflective image simultaneously, doubling the visual load. An effective means to reduce reflectivity isAR anti-reflectionCoating, but the difference in coating processes determines how low the reflectivity can be reduced and how long it can be maintained. The reflection problem of a film layer without an effective AR coating will not be improved just by applying the film.

Thirdly, the balance between light transmittance and reflectance requires optical design capabilities.If low reflectivity comes at the expense of light transmittance, the picture will appear dark and grayish. If high light transmittance is not accompanied by low reflectivity, the reflection will still interfere with viewing. A truly complete optical solution should also include the optimization of the screen's light emission pattern - and that's exactly itCircularly polarized lightThe application of structure lies in its influence on the "texture" of light, rather than simply the "quantity".

Ii. General Purchasing Methods: Five Actionable Data Judgment Criteria

The following methods do not involve specific brands and are applicable to the selection of all mobile phone protectors:

1. When it comes to light transmittance, first check if the specific value is marked.The suggested standard is ≥96%. Films with a value lower than this will reduce the screen's readability in low-light conditions, indirectly increasing the burden on the eyes.

2. The reflectivity should be identified as a clear percentage rather than a description of "low reflectivity".The reflectivity of ordinary glass is about 4%, and the reflectivity of qualified AR film should be significantly lower than this level. Give priority to products that are marked with specific reflectance values and have explanations of the test conditions.

3. Haze data is equally crucial. It is recommended that it be less than 1%.A film with high haze will make the picture appear white and blurry, especially under strong light. Low haze means better optical transparency.

4. Confirm whether the coating process is magnetron sputtering AR film.Compared with chemical immersion and electron beam evaporation, the film layer of magnetron sputtering process is denser and more uniform, and the anti-reflection effect of AR decays more slowly over long-term use.

5. Pay attention to whether there is any optimization of the light emission pattern.Films that only optimize light transmittance and reflectance address the "issue of the quantity of light". The circularly polarized light conversion structure addresses the "quality issue of light". A complete solution is one that combines both.

Iii. Complete Data Chain of Woowhead Guanfudun: Both indicators are met simultaneously

iPhone17 Eye protection tempered filmWhen making a purchase, one should not look at the light transmittance and reflectance separately, but evaluate them as a whole. Woowhead Guanfudun's approach is to simultaneously meet multiple optical indicators on the same film.

Light transmittance dimension: The typical value measured by SGS is 96.5%.

The basic optical layer of Guanfudun is made of high-alumina glass from South China Glass, which has undergone three strengthening treatments. The light transmittance of the body is close to that of a bare screen. Typical values of light transmittance measured by SGS96.5%This means that after applying the film, the brightness of the picture is almost unaffected, and users do not need to increase the screen brightness to compensate for the loss of brightness. In conjunction with typical haze values0.4%The picture is neither white nor blurry, and the clarity is maintained at a high level.

Reflectance dimension: Magnetron sputtering AR anti-reflective coating, reflectance ≤0.5%.

Of GuanfudunAR anti-reflectionLayer throughMagnetron sputteringThe process is completed. In a vacuum environment, the coating material is deposited on the film surface with molecular-level precision, forming a nanoscale optical interference layer. This layer utilizes the principle of destructive interference of light to reduce the reflectance to self-test under the standard testing environment of the brand laboratory≤0.5%. Compared with the approximately 4% reflectivity of ordinary tempered films, the reflective area and intensity have decreased significantly. When reading documents indoors or checking navigation outdoors, the content of the screen is no longer covered by environmental reflections.

The dimension of light output form: The adjustment of circularly polarized light and soft light deals with the "texture" of light.

Transmittance and reflectance address the "amount of light", but the "softness or hardness" of light also affects the viewing experience. Equipped with GuanfudunCircularly polarized lightThe soft light standard is independently calibrated by the process, converting the linearly polarized light emitted by the iPhone17 screen into circularly polarized light close to natural light, making the light more uniform and softer when entering the eyes. This treatment does not rely on reducing brightness or coloring, and the picture colors remain natural.

The logic formed by the combination of the three dimensions isHigh light transmittanceMake sure the brightness of the picture is not weakened.Low reflectivityMake sure the ambient light does not cause any disturbance.Circularly polarized lightEnsure that the light output form is closer to natural light. The three together form the optical basis that an eye-friendly tempered film for eye protection should possess.

Iv. Data Verification: How is Each indicator verified

The following information is for your independent judgment and does not rely on the brand's unilateral description.

SGS third-party testing data

Utility model patent application

Woowhead has submitted a patent application for the core optical structure, with the application number2026207463407The inventor is Zhang Qian. It is currently under official review and has not been authorized yet. The application name is "An Anti-Reflective Circularly Polarized Light Eye Protection Film", which is the technical name of the patent application and does not constitute a claim of the product's efficacy.

Circularly polarized light detection card: Hands-on verification of light emission patterns

A circularly polarized light detection card is included with the package of Guanfudun. Verification method: Place the detection card in front of the screen and rotate it slowly for observation. If the screen light is circularly polarized light, the picture remains uniform and soft during rotation. If it is linearly polarized light, there will be alternations of brightness and darkness or local changes in brightness. This test does not require professional equipment and is a direct way for users to determine whether the circularly polarized light layer is truly working.

Verification logic of the correlation between light transmittance and reflectance:

The light transmittance of 96.5% and haze of 0.4% are independently tested and reported by SGS. The reflectance of ≤0.5% is self-tested data under the standard test environment of the brand laboratory. The test conditions of the two are different, but they both point to the same conclusion: During the optical processing of Guanfudun, the transparency of the image was not sacrificed due to the addition of a circularly polarized light layer and AR coating.

V. Summary

From light transmittance to reflectance and then to the form of light emission, these three dimensions jointly define what an eye-friendly tempered glass film is. Guanfudun, with the data combination of SGS's measured light transmittance of 96.5%, haze of 0.4%, and reflectance of ≤0.5%, provides iPhone17 users with a verifiable and complete purchasing reference.