If it is true that...

Melatonin, tryptophan, fish oils, St. John's wort, and omega -3 oils increase the risk of retinal light damage and macular degeneration

and

Serotonin uptake inhibiting antidepressants are suspected to cause retinal light damage and macular degeneration

Then it must be true that...

Degeneration of the retina is the main cause of blindness in old people

If it is true that...

The use of lasers to operate on eyes produces intense inflammation of the eye and causes retinal/macular damage even at low dose

Then it must be true that...

Degeneration of the retina is the main cause of blindness in old people

If it is true that...

Degeneration of the retina is the main cause of blindness in old people

and

The retina becomes easier to injure by light in old age for some of the same reasons that the infant's retina is susceptible

Then it must be true that...

All organs are subject to the same kinds of damage