I also chose to disregard the less common oils because they're harder to find processed in an organic and cold pressed way. Castor oil on the other hand is a very common oil with a solid industry behind it.
It turns out there is actually an illness called "meibomian gland dysfunction (MGD)" where those glands are unable to produce the lipid / oil necessary for natural eye moisture. Several scientific studies have shown that castor oil is adequate for treating dry eyes:
"The results indicate that castor oil eye drops are effective and safe in the treatment of MGD. The possible mechanisms of this treatment are improvement of tear stability as a result of lipid spreading, ease of meibum expression, prevention of tear evaporation, and the lubricating effect of the oil eye drops."
"A randomized parallel, longitudinal, and investigator-masked study of the efficacy of 1.25% castor oil emulsion and 0.32% hypromellose solution was carried out... The oil-water emulsion was more effective in reducing tear evaporation than hypromellose after repeated application over a 1-month period. This finding signifies the potential of the emulsion in the management of evaporative dry eye."
"Generally, there are no side effects for castor oil eye drops. However, since we all have unique reactions to oils and herbs, it is always recommended to use only a small amount at the start. If any negative reaction does occur, discontinue use immediately.
If you are currently using a medicated eye drop other than the castor oil, it is highly recommended to either only use the castor oil (meaning discontinue the medicated eye drops if appropriate*), or allow an 8-12 hour gap between applications. Please do not use the castor oil eye drops with any other drops unless allowing at least 8 hours between applications. Please consult your doctor if there are any concerns. If a negative reaction does occur, discontinue use immediately.
*Please do not discontinue any prescription eye drops without consulting with your doctor first."
"Always make sure the eyes are clean, dry, and makeup-free. Tilt the head back slightly and apply 1-2 drops into each eye upon awakening. For severe issues, apply this dosage again before bed. After application, close the eyes and gently massage on and around the eye. Allow the oil to penetrate and avoid washing the eye. If the outer eyes are too oily, dab with a piece of tissue to remove any excess oil around the eye (optional).
**For dry, itchy, and red eyes, feel free to apply the castor oil eye drops as needed during flare-ups for instant relief."
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Thank you Spirit for this experience of Life and for answering our callings in creative and amazing ways. Thanks sister, SvasthaAyurveda, wix, Amazon, Google Scholar, scientists and patients, Self and everyone who contributed to the realization of this article.
I hope this information helps you on your journey! Godspeed!! ^_^*