I think that what you are seeing and what you are feeling are unrelated.
First of all, these areas of greenish-appearing areas on the whites of the eyes are a normal phenomenon where the sclera (the white part of the eye) thins in a discrete patch around these particular areas on the sclera. This happens very commonly as we age. The reason it makes the whites of the eyes look green is because what thin white sclera is left is cast against the background of the colored tissues of the eyes (called uvea). The two colors mixed together cast a greenish-hue.
The foreign-body sensation you are likely feeling is possibly from a foreign-body that got in the eyes when you were working in the yard. Many times once you wash the eyes the foreign-body will fall out; or many times it falls out on its own. Either way, though, you can still feel the effects of the foreign-body as though it were still there. I would advise repeating the eye rinsing with an eye rinse solution you can buy over the counter at the drug store. I would also advise using artificial tears 4-5x/day in that eye to see if that improves your symptoms.
However, it may be that there is still a foreign-body in the eye that is small enough that you can't see it without a microscope. If your symptoms don't improve with these treatments it may be because a foreign-body is still in there that you can't see. Or there may be a different problem. Bot***** *****ne: if your symptoms aren't gone over the next couple of days, or if your eye becomes red, discharge begins to come from the eye or the vision starts to change significantly then you should be seen by your ophthalmologist because organic foreign bodies can cause significant infections in the eyes if left untreated.
Does that make sense and does that help address your concerns?
I am happy to be able to help you today.
Any positive feedback and/or bonus you may feel prompted to provide would be welcomed and is appreciated. Thanks for your inquiry!
My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.