Essential oils are aromatic liquids distilled from plants– flowers, trees, roots, bushes, seeds– with a complex chemistry. They are much more potent than dried herbs (which are the plant parts with the essential oils mostly removed).

So it is important to use therapeutic grade essential oils. A therapeutic-grade essential oil is one that is both complete in its chemical constituents and retains the innate coherent vibrational frequency of the original plant materials. This is important, because the oil’s fragrance, frequency and chemistry all contribute to its unique therapeutic effects.

Many of us have heard that “eating carrots can improve eyesight,” however, there are a number of essential oils that have been found to enhance vision as well as to improve the appearance of the eyes.
Caution: Never put essential oils directly on the eyes or eyelids.
Dr. Terry Friedmann, MD, eliminated his need for glasses in 1997 by applying sandalwood and juniper on the areas around his eyes– above the eyebrows and on the cheeks (careful not to get the oils anywhere near his eyes). He also took supplements, but attributes his impressive eye improvement mostly to the use of these essential oils.
I get asked a lot about essential oils and eyesight.
According to Dr Axe, “Frankincense oil has been demonstrated to improve eyesight, helichrysum oil improves vision and supports nerve tissue and cypress essential oil improve circulation which can improve macular degeneration.
Apply 3 drops of any of these essential oils 2x daily on cheeks and lateral eye area but do not put directly into eyes.”
For blurred vision you could try the following essential oils: Helichrysum, Lavender, or Peppermint. Again, apply on the areas around your eyes– above the eyebrows and on the cheeks (careful not to get the oils anywhere near your eyes).
CYPRESS: strengthens capillaries and improves circulation.
FRANKINCENSE: reduces inflammation and can reduce fine lines and wrinkles
LAVENDER: promotes tissue regeneration; is soothing for skin
LEMONGRASS: tones and assists in regeneration of connective tissue; promotes lymph flow; dilates blood vessels, strengthens vascular walls; improves circulation
SANDALWOOD: revitalizes and hydrates skin; supports circulation
And some TIPS for essential oil use for your eyes: 
Apply the oils around the eye socket of your eye. You never want to put them in your eyes because it would be quite painful! If you ever accidentally get oils in your eye, do not use water to flush it out! This only spreads the oils more. You want to use another carrier oil like olive oil, coconut oil, almond oil, etc to get them out.
And in case of emergencies or serious health problems, always consult your doctor!