Resultats cercant per
categoria Optics
| 08-06-2012 (988 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 (830 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 (759 lectures)
| |
Un frontofocòmetre o lensòmetre (en anglès:lensometer), Ă©s un instrument òptic per a la determinaciĂł del centre òptic i el mesurament de la potència d'una lent oftĂ lmica, aixĂ com la direcciĂł de la component cilĂndrica.[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 (700 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...
