Source: https://www.allaboutvision.com/ Very important: Always make sure you discuss and make decisions about your eye care based upon a formal appointment with your optician. For more information and to book and eye examination please contact us: Specs Direct  |  Professional Affordable Eyewear 20 McIntyre Street, Parow, Cape Town 7500 Tel: 021 939 1020 info@specdirect.co.za