Children up to the age 10 and puppies age 2 have very thin lenses in-the-Eye. It is then both are highly susceptible to the harmful new UVB radiation. After age 10 and 2(Puppies) their lenses thicken for some UV protection but not_UVB protection.
Dogs and humans do not have the natural filters in the eye in order to block UVB blue light; only UV.. It is this blue light that is toxic to the eye’s lens, thus leading to Retinal cell death and early Cataracts.

The puppy’s nose, so low to the ground, and the ground acting as a mirror, the reflected UVB radiation enters right into the eye… this is when they need UVB Photochromics the most.

Puppy cataracts will form more early than humans and can lead to more serious ocular anomalies if not removed (Diabetes, Glaucoma and AMD).
Dog depression and mood changes result from the UVB blue light depleting their melatonin (Sleep Apnea, Obesity, General fatigue). Kids suffer the same from their Electronic devices.

…why not your Puppy