Preface Have you ever wondered why you can read worse as you age? This is normal and is called presbyopia or age-related hyperopia. The cause of presbyopia is the loss of elasticity in the eye lenses. This means that our visual system weakens with increasing age and the eye lens is no longer elastic enough to give nearby objects the proper sharpness. Many people suffer from age-related hyperopia from the age of 35. It is often difficult to see things up close - for example, when reading books, brochures. Reading glasses are a simple but effective tool for this visual weakness. Most blue light filters available today also go by names like 'computer glasses' or 'gamer glasses'. When should you use blue light filter glasses? Many people today spend 8 hours or more a day at their workplace in front of a computer or for fun