heard the one about Prescription windscreens, a joke familiar to many practitioners, were discussed by US stand-up comedian Jerry Seinfeld at his stage show at London's O2 Arena on June 3. Prescription windshields are a long-standing favourite April fool for both the automotive and optical industries. Auto-Trader magazine once suggested that Ford was offering free-eye tests to those who purchased a prescription windscreen option with a new vehicle and that Specsavers was developing a rival prescription product.