Hearing loss is common, and there’s a good chance it will impact you or someone close to you in your lifetime. The World Health Organization predicts that one in four people will have some degree of hearing loss by 2050. Below, I’ve pooled several smartphone features I tested with the help of family members with varying degrees of hearing loss. Hearing loss is often incurable, and hearing damage can leave you with permanent conditions like tinnitus (usually perceived as a ringing in the ears), so it is vital to protect your hearing in loud environments. Open the Apple Watch app on your iPhone, tap the My Watch tab, then tap Noise > Noise Threshold.