I refer to the letter from David Slough headlined 'Sunglasses can also impair vision' (South China Morning Post, June 18), seeking an explanation as to why the wearing of sunglasses should not be banned if the Government is not going to permit the installation of 'non-approved' tinted windows on vehicles.
Common sense would suggest that the comparison of sunglasses with tinted windows is unsound. This is because:
While tinted windows are fixtures, sunglasses are not. Drivers would usually only opt to wear sunglasses if the glare from the sun was strong. Rather than impair vision, this would not only protect one's eyes but also lessen the glare. Drivers would normally not opt to wear sunglasses if weather conditions or visibility were poor.
Usually, tinting is only applied to the rear and side windows and not the windscreen and hence the need for sunglasses.