As the environment of outside can be unpredictable, so there can be a lot of factors to cause the problem. First of all, it may be the allergic reaction comes from the fowers powder( it’ s very common in spring you know) , so you have to use eyedrops to relieve it after you have confirmed it. Secondly, it may be the dust of storm( I wonder if you are living in the north of China where in spring, storm can be very frequent), some unknown bacterias on the dust can induce eye problems. Thirdly, it can be the sun light. If you fear of light, it does indicate that you may have some eye problem, you’ d better have a check to find the problem.
Hope that will help.