Recommendations:
1. Try not to play at the time of day of when the sun will be in your eyes when serving (I know this is not always practical).
2. Wear sunglasses - virtually all sunglasses remove most of the harmful Ultraviolet rays. Curved sunglasses that tightly fit the face without allowing a lot of sunlight in from the sides, top or bottom would be best. (See below for color of lens, ultraviolet absorption, problem with teal "competivision" lenses*.)
3. Wear a hat - it decreases the amount of sun that can get in around the frames, plus decreases the amount of glare on the lenses.
4. Develop twist and slice serves with different toss locations - What's more important, your eyes, or stubbornly serving from a toss in the same spot every time? Sun happens. Don't be so shocked when it's sunny. Don't be shocked if serving from a different spot slightly changes your serve, changing your opponents timing, and resulting in an easy service hold. (Hmm, maybe you should even do this if the sun isn't in your eyes!)
* The following is an interesting article from an opthalmologist stating that the teal colored "competivision" sunglasses don't provide the same eye protection that grey or brown lenses do:
From - Double Fault! Ocular Hazards of a Tennis Sunglass
by Michael F. Marmor, MD
Arch Ophthalmol. 2001;119:1064-1066.
"From the standpoint of improving the contrast or visibility of a tennis ball to enhance sports performance, this design is inherently flawed on any court with a greenish surface, which comprises most hard and clay courts in the United States. Through a blue-green lens, a yellow ball appears greenish (Figure 2) and thus is less visible against the green court (which will seem bright through this lens). The same would apply for a yellow or white golf ball viewed against green grass. Furthermore, blue light in general is less effective physiologically with respect to functions such as acuity, contrast detection, and motion perception.2-3 In other words, critical perceptions are actually reduced rather than enhanced. These bluish lenses will be of no visual benefit except possibly on a reddish or amber court (such as the red clay of Roland Garros). Here, the ball may appear to be relatively light against a darker court, but
these lenses still should not be worn because of the hazard associated with blue light."
"A statement4 on ocular UV radiation hazards in sunlight, endorsed by the American Academy of Ophthalmology, the American Optometric Association, and Prevent Blindness America, advises that
sunglasses should block 99% to 100% of the full UV spectrum (UV-A extends up to 380-400 nm). The document notes that additional protection for the retina can be provided by lenses that reduce the transmission of violet-blue visible light. These recommendations follow the findings of many researchers,5-9 and reflect concerns that both near-UV and visible blue light may contribute to macular aging and degeneration.
Blue lenses do exactly the opposite: they block long wavelengths and admit the violet-blue end of the light spectrum. They are not only substandard as sunglasses but could, under some circumstances, be more hazardous than wearing no glasses at all. Because so much of the bright (yellow) end of the light spectrum is blocked, the world appears subjectively dark through blue glasses, and the wearer might spend extra time in the sun or have a relatively dilated pupil. If either of these occurs, the eyes could be exposed to more short wavelength light than without any lenses."
"
A neutral gray or amber sunglass that blocks 99% to 100% of UV-A and UV-B light will provide additional protection and may even help slightly to make the ball stand out (depending on the color of the court). However, there is no rationale for a blue lens, whether for children, tennis players, or anyone else. Ophthalmologists should be aware of the properties and the risks of blue lenses to advise parents of young children and sports-minded patients. Tennis players in particular should be aware that a blue lens commits a double fault, and does not serve well for either perception or safety."
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http://archopht.ama-assn.org/cgi/con...ull/119/7/1064
