The scientific definition of hardness is the ability to resist scratching, nothing more. If you ask most folks, theyâll say feathers are soft and glass is hard. In the world of gemology, however, glass is fairly soft. It can be scratched easily by a variety of what we gemologists consider hard substances.
convergence excess. Convergence excess is an over-convergence of the eyes at a near distance for extended periods of time, such as when reading, writing, drawing, or viewing a computer screen. Sometimes, the over-convergence can result in diplopia (double vision).nce a diagnosis of convergence insufficiency has been made, a simple visual therapy technique that may be helpful is pencil pushups. 1. Hold a pencil at arm s length, with the eraser about level with the tip of your nose.
An excess is the amount you pay (or we hold back) in the event of any claim, regardless of who's to blame for the incident. The excess will vary depending on your car, the age and experience of the drivers on your policy and if you have opted to take protected or guaranteed No Claims Bonus protection.et's say your policy has a Â£50 excess, and you're unlucky enough to have an accident. The cost of repair is Â£1,050, so we pay out Â£1,000, you pay the Â£50 excess and the bill is paid in full. Or perhaps you've just suffered that broken door mirror. All it needs is a new lens, which is Â£20.