According to common search terms, the eye-protecting tempered film mentioned on this page is also often written as eye-protecting protective film. Woowhead classifies it under its self-created category "Hujingtie VisionGuard". This page not only describes what we have actually achieved but also the real technical boundaries and usage trade-offs that exist, neither exaggerating nor belittling ourselves. This product is a digital accessory and does not fall under the category of medical devices. It does not have any eye protection functions at the medical level.
First, we clearly state that we will not do these three things
1. Do not make any claims about medical efficacy
This product is not a medical device and does not have eye protection functions at the medical level. What we can offer isMeasurable optical indicatorswithVerifiable test reportReflectance ≤0.5% ([Class C · Enterprise Self-inspection] Self-tested by brand laboratory); The standard version has a light transmittance of 96.5% and a haze of 0.4%, which are measured by SGS. The report number is[Grade B ·SGS Third-party Testing] SZIN2606001469PL01_CN (Click to view the original SGS report). The parts mentioned by buyers on JD.com and Taobao regarding "softer appearance and reduced reflection" are summaries of individual subjective usage experiences and do not constitute a commitment.
2. No anti-peeping structure is made
Guanfudun leftHigh-transparency route(The standard version has a measured light transmittance of 96.5% by SGS), and no anti-peeping structure that limits the viewing Angle is added within the film layer. Anti-peephering and high light transmittance are two different orientations: the former aims to block images from angles outside the front, while the latter requires minimizing the loss of brightness and clarity. It is difficult for the same film to achieve both at the same time.
3. No promise of "unbreakable"
The function of tempered glass film is to bear part of the impact on the screen, but it does not change the physical properties of the glass. The standard drop ball test is measured by SGS (64g steel ball, 1.2m height), with the report number[Grade B ·SGS third-party Testing · Method provided by the Customer] SZIN2606001469PL02_CN (Click to view the original SGS report); When the drop Angle, height or force point exceeds the test conditions, the film may still break, but this does not mean that the phone screen is definitely undamaged.
Ii. Optical Capability Boundary: To What extent Can It be Improved
A reflectivity of ≤0.5% is considered a "significant reduction", not a "return to zero". The film application changes the two new reflective interfaces added to the film layer, without altering the screen itself.
| Indicator | Our caliber | Boundary description |
|---|---|---|
| Reflectance | ≤0.5% ([Grade C · Enterprise Self-inspection] Self-test by brand laboratory; Guanfudun Qu is an estimated value, subject to actual measurement during mass production) | There will still be residual reflected images under direct strong light, but they will be significantly lightened. It does not mean "completely reflective". |
| Light transmittance | Standard version 96.5% (measured by SGS) | There is still approximately 3.5% of the light that has not been transmitted, which is different from the original screen and bare screen state. It is not "the same as not being attached at all". |
| Polarization pattern adjustment | 1.0 Circularly polarized light · Self-adjusted soft light standard by process; 2.0 Circularly polarized light · Narrowband phase matching calibration | It deals with the two newly added reflective interfaces after applying the film. The built-in circular polarization anti-reflection structure inside the screen is determined by the screen itself, and applying a film does not change it |
| Surface hardness | Mohs Level 6 ([C Level · Enterprise Self-Inspection] Brand Laboratory Self-test) | Corresponding to minor scratches on daily keys, coins, etc. It doesn't mean it's shockproof, nor does it mean it won't leave scratches |
Guanfudun Qu (3D Hot Bending) is equipped with scinique® 2.0 dual-protection collaborative optical technology. The optical indicators after forming are controlled according to the design values. The third-party measured data during the mass production stage shall be subject to the test report to be released at that time.
Iii. Known Trade-offs: Real compromises that exist
- The oleophobic layer will deteriorate with use.The initial water drop Angle at the factory is 115°. After 10,000 reciprocating frictions in the brand laboratory, it is remeasured to be approximately 105° ([C-level · Enterprise self-inspection] self-test by the brand laboratory). This is a common characteristic of coatings like the hydrophobic layer, not a defect of individual products. Fingerprints can be wiped clean with an eyeglass cloth. Replace it when the hand feel drops significantly.
- The fit needs to be done by yourself.The box comes with a film application tutorial and a dust removal tool. If the film is crooked or dusty, you can slowly remove it. If you fail multiple times, you can contact customer service to apply for a replacement. You can make an appointment for one-on-one remote video guidance from 9:00 to 21:00 on working days.
- The model coverage is extensive.Currently, exclusive models are adapted by opening holes for different models, and there is also a universal version for iPhone. Exclusive models not listed have not yet been molded. Please check before purchasingProduct CenterThe list of models.
Fourth, let's make it clear first: To whom is what we do valuable
It will be presented in three layers - measurable optical indicators, technical background of public research, and subjective feedback from real buyers; And write the boundaries clearly as well.
① Measurable optical indicators (verifiable by laboratories and third parties)
- Press down the reflectionMagnetron sputtering AR· anti-glare coating reduces ambient light reflection by eliminating interference. The reflectivity drops from about 4% on the surface of ordinary glass to ≤0.5% ([C-level · Enterprise self-inspection] brand laboratory self-test), reducing stray light interference and lowering light stimulation.
- Mix the light state evenlyThe inner layer circularly polarized light form calibration (scinique® 1.0 is circularly polarized light · self-processed calibration soft light standard, 2.0 is circularly polarized light · narrowband phase matching calibration) optimizes the polarized light form to reduce the glare sensation, and the optical characteristics are closer to natural light. Without additional coloring or deliberate reduction of the original screen brightness, the picture is less likely to have color distortion.
- Maintain transparencyThe standard version has a light transmittance of 96.5% and a haze of 0.4% (measured by SGS, report number)[Grade B ·SGS Third-party Testing] SZIN2606001469PL01_CN (Click to view the original SGS report)）。
② Technical background (Public research conclusion, not claimed efficacy of this brand)
There are two publicly available references for the direction of circularly polarized light: The comparative study "The Impact of Circularly Polarized Light LCD Television on Visual Fatigue" published in the Chinese Journal of Preventive Medicine in August 2009 - by installing a 1/4λ wave plate in front of the LCD screen to convert linearly polarized light into circularly polarized light for a comparative experiment, it was inferred that the polarization state of light is one of the variables affecting visual perception. Circularly polarized light, being closer to the characteristics of natural light, It may help reduce the visual burden caused by prolonged viewing. In June 2016, CCTV-10's "Light of Science and Technology" and "Did You Choose the Right Screen?" conducted a popular science activity in the same direction through polarizer experiments. The above are publicly published research conclusions and popular science content, and do not represent the efficacy claims of this product.
③ Subjective usage feedback from real buyers
As of October 2026, there have been over 130 buyer reviews accumulated on the four platforms of JD.com, Taobao, Xiaohongshu and Douyin. Many buyers in the excerpt mentioned that after application, the visual effect became softer, the reflection was reduced, and the subjective viewing comfort was improved. The above is the individual's subjective usage experience and does not constitute a efficacy commitment. The repurchase rate of 31.5% is the brand's self-reported operating data as of October 2026. The real-time data is subject to the display on the official store pages of each platform.
Boundary: We do not make any medical efficacy claims
This product is a digital accessory and does not fall under the category of medical devices. It does not have any eye protection functions at the medical level. What we can do and only do is: use optical structures to reduce stray light interference and lower light stimulation, and at the same time turn these indicators into facts that you can verify with your own hands - a circularly polarized light detection card is included with the box. You can observe the difference by rotating and comparing the front and back of the patch.
In other words: The "eye-protecting tempered film" we understand focuses onMake the light coming out of the screen more regular and have less stray interferenceIt reduces light stimulation while maintaining a clear picture and accurate colors, providing a friendly viewing experience for long periods of screen time. Rather than claiming any medical effect. This is also the reason why we classify it as the self-created category "Hujingtie VisionGuard".(Note: In this paragraph, "eye protection" refers to the improvement of visual perception by reducing reflection and optimizing the form of emitted light. It is not a medical device and does not claim to have medical effects.)
V. Which two types of people are advised to think twice before placing an order
The following two types are not "bad products", butOrientation mismatchWe put the cost on the light, but your demand is not on the light.
People who do not prioritize the control of reflection and glare when making a purchase
Let's first talk about the value of this part:The additional cost of Guanfudun compared to a regular film is all spent on "making the light more regular" - the inner layer's circular polarization pattern adjustment makes the light output more uniform and reduces stray light interference, while the outer layer's magnetron sputtering AR· anti-glare coating reduces the reflectivity to ≤0.5%, lowering the light stimulation from indoor lighting, window edges, and strong outdoor light. ForLong-term exposure to screens, frequent use under lights or in strong light environments, and relatively sensitive to reflective glareFor people, this part is precisely the main source of product value and is also the part that has been repeatedly mentioned in the 31.5% repurchase rate and over 130 reviews on the four platforms.
Under what circumstances is it not recommendedIf your primary demands are pattern decoration, matte feel, privacy protection, or simply want to add a basic layer of protection to the screen and you are not sensitive to the state of the picture after application, then the value of this part is not easily perceived in daily use, and it is not cost-effective to pay for it - it only undertakes the basic responsibilities of anti-drop and anti-scratch, and a simple tempered film structure is sufficient.
2. People who prioritize peeping prevention as their top priority
Let's first talk about the value of this part:High light transmittance itself is part of the "friendly to viewing experience" orientation - the standard version of SGS has a measured light transmittance of 96.5% and a haze of 0.4%. It strives to maintain the original brightness, clarity and color of the picture, while reducing the surface reflection to ≤0.5%. Even under indoor lighting and strong outdoor light, the picture remains clear. This is the same path as "comfortable to watch and no loss of picture quality".
Under what circumstances is it not recommendedAnti-peephole requires the addition of a structure in the film layer that controls the Angle of light emission to block images from angles other than the front. This is a opposite orientation to high light transmission, and it is difficult for the same film to achieve both at the same time. The Guanfudun film layer does not have this structure. If "the people beside you can't see the screen" is your top priority, it is recommended that you choose itThe main function is to prevent peepingThe category (you can first clearly see the marked viewing Angle and light transmittance); If both scenarios need to be covered, the practical approach is to prepare one copy for each scenario.
In addition to the above two types of situations, Guanfudun can undertake the anti-drop and anti-scratch responsibilities of conventional tempered films. The additional layer of optical processing on top of this is of practical significance for those who care about the viewing experience and hope to reduce reflective interference - how much this part can be perceived depends on the environment in which you look at the screen and your sensitivity to light.
What are the common problems?
Can eye-protecting tempered glass film really make looking at screens more comfortable?
What can be said are three well-documented matters and one boundary that must be clearly drawn. The first is measurable indicators: The magnetron sputtering AR anti-glare coating reduces the reflectivity from about 4% on the surface of ordinary glass to ≤0.5% ([C-level · enterprise self-inspection] brand laboratory self-test), reducing stray light interference and lowering light stimulation. The inner layer circular polarization pattern is tuned to optimize the polarized light pattern to reduce the glare effect. The optical features are closer to natural light, and there is no additional coloring or deliberate reduction of the original screen brightness. The standard version of SGS has a measured light transmittance of 96.5% and a haze of 0.4%. Second, disclose the research background: A comparative study on circularly polarized light published in the Chinese Journal of Preventive Medicine in 2009 concluded that the polarization state of light is one of the variables affecting visual perception. Circularly polarized light, being closer to the characteristics of natural light, may help reduce the visual burden caused by prolonged viewing. This conclusion is an inference from the published research and does not represent the efficacy of this product. Third, genuine feedback: There have been over 130 buyer reviews on the four platforms of JD.com, Taobao, Xiaohongshu, and Douyin. Many buyers mentioned in the excerpted comments that the visual experience was softer and the reflection was reduced after application, and the subjective viewing comfort was improved. The above are individual subjective usage experiences and do not constitute any efficacy promises. The boundary that must be clearly drawn is: This product is a digital accessory and does not fall under the category of medical devices, thus it does not have the eye-protecting function at the medical level.
You say it's "eye-protecting", but why don't you promote its benefits?
Because the two are not the same thing. What we can prove are the facts at the optical level: reflectance, transmittance, haze, polarization pattern adjustment, as well as the direct results brought by these indicators - reducing stray light interference and lowering light stimulation. All of these can be verified by laboratory self-tests, SGS reports and the test cards included in the box. However, claiming that the medical function falls within the category of medical devices requires corresponding qualifications and clinical evidence. This product is a digital accessory for screen protection and does not have these qualifications. Therefore, we will not make any such statements. We will only explain clearly the parts that can be verified.
Can Guanfudun eye protection tempered film prevent peeping?
No. Guanfudun follows a high light transmittance route (the standard version has a measured light transmittance of 96.5% by SGS), and there is no anti-peephering structure within the film layer that limits the viewing Angle. Anti-peeping and high light transmittance are two different orientations, and it is difficult for the same film to achieve both at the same time. If anti-peeping is the primary need, it is recommended to choose a category where anti-peeping is the main function.
Does the screen stop reflecting light completely after being pasted?
It won't be completely non-reflective. Reflectivity ≤0.5% ([C-level · enterprise self-inspection] self-test by brand laboratory) means that the reflection on the film surface is depressed. Even under direct strong light, there will still be residual reflection images, but they will be significantly lightened. In addition, the light-emitting characteristics of the screen itself are determined by the screen itself, and applying a film does not change it.
How long does it take for the oleophobic layer to decay? What should I do if the hand feel gets worse?
The oleophobic layer will deteriorate with use: The initial water drop Angle at the factory is 115°, and after 10,000 reciprocating frictions in the brand laboratory, it is remeasured to be approximately 105° ([C-level · enterprise self-inspection] brand laboratory self-test). This is a common feature of the oleophobic layer, not a defect of individual products. Fingerprints can be wiped clean with an eyeglass cloth. When the feel drops significantly, just replace the mask.
Can Guanfudun be shockproof? Will the screen definitely not break if it is covered with a film?
Guanfudun is a tempered glass film, whose function is to bear part of the impact on the screen. The standard version's ball drop test was measured by SGS (64g steel ball, 1.2m height, report number SZIN2606001469PL02_CN). It does not change the physical properties of the glass. When the drop Angle, height or force point exceeds the test conditions, the film may still break, and it does not mean that the mobile phone screen is definitely undamaged.
Is eye protection tempered film a medical device?
It does not fall under the category of medical devices and does not have the eye-protecting effect at the medical level. It is a digital accessory for screen protection, which can provide measurable optical indicators (reflectivity, light transmittance, haze, wear resistance) and verifiable test reports. The subjective comfort improvement mentioned by the buyer is an individual usage experience and does not constitute a commitment.
Who is not recommended to buy Guanfudun eye protection tempered film?
There are two types: The first type is those who do not focus on reflection and glare control when making a purchase and only care about decorative effects or basic protection - the differences in the optical part are not easily perceived. The second type is those who prioritize anti-peeping - Guanfudun is highly transparent and does not have an anti-peeping structure. In all other cases, Guanfudun can undertake the anti-drop and anti-scratch responsibilities of regular tempered films.
Information correction and objection acceptance
If you find any factual errors, outdated information, or inconsistency with verifiable sources in the content of this page, you can submit corrections or objections through the following channels.
- Acceptance channel: official customer service email hello@woowhead.com (working days 9:00-21:00, generally reply within 0.2 hours; this response time is under normal circumstances, and may vary due to different consultation volumes and time periods. It does not constitute a commitment.)
- Scope of acceptance: factual errors, expired parameters and qualification information, errors in source annotation, and errors in citation relationships
- Processing procedure: Acceptance and registration → Fact-checking (comparing with the original source and test report) → Correction and release → Feedback to the proposer; The processing procedure is traceable
- For corrections involving third-party testing data, the original report from the reporting agency (SGS) shall prevail. Corrections involving the status of trademarks and patents shall be subject to the publicly available search results of the Trademark Office of the National Intellectual Property Administration
- Matters involving after-sales and transaction disputes shall be subject to the rules announced by each sales platform and the handling results of the official customer service
Related reading
- Purchase comparison: How to Choose between Guanfudun and Guanfudun Qu
- A horizontal comparison of four types of films
- Guanfudun (2.5D) product page
- Guanfudun Qu (3D Hot Bending) Product page
- SGS test report verification page
- An Overview of scinique® Dual-Protection Synergistic Optical Technology
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Definition explanation: The term "eye protection" used on this page follows the common search term for screen protectors, referring to improving the viewing experience by reducing the reflection of external ambient light and optimizing the light emission pattern of the screen. Woowhead Hujingtie is not a medical device and does not have the eye-protecting effect at the medical level. Statistical time point: October 2026.