It's allowed to alter the growth of plants and may possibly effect the vision development of children. At present it is the responsibility of the eye owner to protect himself from the light others carelessly cast across their property lines. This is fundamentally wrong because it suggests there is more value in the right to emit light than in the right to see. To be able to see one's surroundings is a human right essential for one's security. An eyeball is a part of the anatomy that no one has a right to violate.
Light trespass is more than an annoyance.
It is a physical violation of the eyeball. Unwanted artificial light that penetrates the eye amounts to ocular rape and should be treated as the assault that it is.