Apple made a big deal about the iPhone 17’s Ceramic Shield 2 when the phone launched, claiming the new anti-reflective coating cuts glare in half. (That’s compared to the iPhone 16.) But slapping a generic screen protector on your iPhone 17 erases that improvement entirely.
Astropad, an Apple device accessory brand that makes its own anti-glare screen protector, tested reflectivity across multiple devices and found that the iPhone 16 Pro’s display reflects 3.8% of light. In comparison, iPhone 17 Pro drops that to 2.0%. But as soon as one adds a standard transparent protector, the iPhone 17’s reflectivity jumps to 4.6%.
The problem lies in how anti-reflective coatings work, Astropad explains. Apple designed the Ceramic Shield 2’s anti-glare layers to sit at the glass-to-air boundary. When you put on a screen protector with adhesive, the coating is no longer in direct contact with air. The thin-film stack that cancels reflected light through destructive interference becomes useless because it’s now “seeing” glue rather than open space. Astropad’s testing demonstrates that generic protectors without their own anti-reflective layer roughly double the iPhone 17’s reflectivity.
This means buyers who grab tempered glass or standard matte protectors are unknowingly reversing Apple’s flagship display upgrade.