Squinting, however, provides protection from ultraviolet rays that is at least as good as the protection from nonprescription sunglasses. There is, therefore, no health advantage to be gained by wearing nonprescription sunglasses rather than squinting. Some nonprescription sunglasses provide less protection from ultraviolet sunlight than does squinting. Squinting strains facial muscles and causes headaches and fatigue. Many people buy sunglasses because they feel the sunglasses are fashionable.
Some people squint even when they are wearing sunglasses.
The translation by the administration of theory into prescribed practice must therefore be flawed. Teachers differ in their ability to teach in accordance with standardized programs. The educational research on which the standardized teaching programs are based is sound. Researchers should be the ones to translate their own research into teaching programs. The ways in which teachers choose to implement the programs is ineffective.