Vitamin B12 Eye Drops work to relieve eye discomfort caused by eyestrain. Vitamin B12 is a nutrient that promotes the growth and repair of nerve tissues. By using vitamin B12 eye drops in the eye, the medication can enter a variety of tissues inside the eye, such as the retina and the eye muscles, giving the eye tissues a full complement of nutrients. When symptoms of eyestrain occur such as dry, sore eyes, vitamin B12 drops in the eye can relieve these uncomfortable symptoms. It should be noted that it should be used with caution in patients with glaucoma and is contraindicated in those who are allergic to vitamin B12. It is recommended to use eye drops under the guidance of a medical professional.