Wear sunglasses that filter 99-100 percent of the UV radiation. The most dangerous wavelengths to the eye are the ultraviolet (UV) rays.
A simple eye exercises like holding a pen out at arm’s length and looking at its tip till tears roll down your cheeks. This helps clear the eyes and reduces eyes strain.
A good night’s rest is what your eyes require after strenuous day.
Splash your eyes with cold water this helps cool them from the summer heat.