Fact check: Neuartige Kontaktlinse ermöglicht Sehen mit geschlossenen Augen

1. Summary of the results

The statement is extensively corroborated by multiple independent sources. Chinese researchers have successfully developed a novel contact lens that enables users to perceive infrared light even with closed eyes ^{[1] [2]}. The technology works by using specialized nanoparticles made of materials including gold and rare earth ions that convert near-infrared light (800-1,600 nanometers) into visible light (400-700 nanometers) ^{[3] [4]}.

The effectiveness of this technology has been scientifically validated through tests on both mice and human subjects ^[5]. Remarkably, the vision capability actually improves when eyes are closed, as infrared light penetrates eyelids more effectively than visible light - with infrared penetration at 23.292% compared to visible light at just 0.388% ^[4].

2. Missing context/alternative viewpoints

Several important contextual details are missing from the original statement:

• Current limitations: The technology currently only provides blurry infrared "sight," and researchers are still working on improving resolution ^[1]
• Cost implications: The researchers estimate these specialized lenses could cost around $200 per pair ^[3]
• Technical specifications: The lenses specifically work with near-infrared light, not the entire infrared spectrum ^[3]
• Functionality: Users can recognize infrared signals and their direction, suggesting specific use cases rather than full vision capability ^[2]

3. Potential misinformation/bias in the original statement

While the original statement is technically accurate, it potentially understates the complexity of the technology. The statement might lead readers to believe the lenses provide normal vision with closed eyes, when in fact they:

• Only provide infrared vision capability ^[1]
• Currently produce blurry images ^[3]
• Work better with closed eyes specifically because of reduced light interference, not because they replicate normal vision ^[6]

The statement also omits mentioning that this is a Chinese technological achievement ^[2], which could be relevant for understanding the broader context of global technological advancement and competition in this field.