Resultats cercant per
categoria Optics
| 08-06-2012 (578 lectures)
| |
Presbyopia is the normal loss of near focusing ability that occurs with age. Most people begin to notice the effects of presbyopia sometime after age 40, when they start having trouble seeing small print clearly — including text messages on their phone.
You can't escape presbyopia, even if you've never had a vision problem before. Even people who are nearsighted will notice that their near vision blurs when they wear their usual eyeglasses or contact lenses to correct distance...
| 08-06-2012 (546 lectures)
| |
Presbyopia is the normal loss of near focusing ability that occurs with age. Most people begin to notice the effects of presbyopia sometime after age 40, when they start having trouble seeing small print clearly — including text messages on their phone.
You can't escape presbyopia, even if you've never had a vision problem before. Even people who are nearsighted will notice that their near vision blurs when they wear their usual eyeglasses or contact lenses to correct distance...
| 08-06-2012 (588 lectures)
| |
Un frontofocòmetre o lensòmetre (en anglès:lensometer), és un instrument òptic per a la determinació del centre òptic i el mesurament de la potència d'una lent oftà lmica, aixà com la direcció de la component cilÃndrica.[1][2]
S'utilitza per marcar les lents oftà lmiques abans de tallar-les, d'acord amb la muntura. Disposa d'unes plomes per poder marcar el centre òptic i la direcció de...
| 08-06-2012 (513 lectures)
| |
Presbyopia is the normal loss of near focusing ability that occurs with age. Most people begin to notice the effects of presbyopia sometime after age 40, when they start having trouble seeing small print clearly — including text messages on their phone.
You can't escape presbyopia, even if you've never had a vision problem before. Even people who are nearsighted will notice that their near vision blurs when they wear their usual eyeglasses or contact lenses to correct distance...
