Castor oil is a soothing and healing oil for eye problems like pterygium. Use only cold pressed hexane free castor oil in your eyes. Drop one drop of castor oil into your affected eye at bedtime. This will cause a temporary blurriness from the oil. It may also sting a bit but the sting gives way to a soothing feeling. Castor oil is a highly penetrating oil. Some treat eyes by just applying castor oil to the lids of the eyes at bedtime. This is also a natural remedy for insomnia, so enjoy a good night sleep while you treat your pterygium!