PPT-History of Lenses

Luke Liao 1 Overview Background on Lenses Definition of a Lens Lens Effects Basic Lens Terminology History of Lenses Ancient Lenses Renaissance Lenses Modern Lenses Conclusion 2 Definition of a Lens. Just follow the steps below and be sure to ask your eye care practitioner if heshe has any helpful tips to share with you Practice makes perfect How To Insert Your Contact Lenses 146 C c WW W c 2g gc W W 1 Wash Rinse and Dry Your Hands 146 3 W W Decorative contact lenses are sometimes called t fashion contact lenses t Halloween contact lenses t color contact lenses t cosmetic contact lenses t theatre contact lenses and others Decorative contact lenses just change the look of your eyes They Cara Morris, OD, FAAO. Types of Contact Lenses. Soft. Silicon . Hydrogels. Hydrogels. Gas Permeable. Hard (PMMA ) not used anymore. Hybrid. Synergeyes. (RGP in center and a . hydrogel. skirt). Soft Contact Lenses. Jim Schwiegerling PhD. College of Optical Sciences. University of Arizona. Tucson, Arizona. Euclid. Raphael’s . School of Athens. Euclid ~300BC. Greek mathematician. His book . Elements. used to teach geometry for over 2000 years.. HCT II. Astigmatism. An abnormal shape or curvature of the cornea that causes blurred vision. . This causes light rays to focus on multiple areas of the retina. Cover one eye and look at the chart. Then close the other eye and look at the chart again. . Refraction of Light. EM lesson 8. Convex . (converging) Lens. Thicker in the center than at the edges. Have positive focal lengths . Converge. . parallel rays of light that pass through them. Rules for convex lenses. Lenses and Optical Instruments . Key Points. Thin Lenses; Ray Tracing. Combinations of Lenses. The Human Eye; Corrective Lenses. Compound Microscope. References. 23. -7,8,9; 25-2,3,4,5. . Thin lenses are those whose thickness is small compared to their radius of curvature. They may be either converging (a) or diverging (b).. . How Do Your Eyes Help You See?. A lens is a curved surface, like a piece of glass or plastic.. Its curved shape makes light bend.. Lenses can make objects appear bigger or smaller to our eyes.. What is a lens?. JATIN ASHAR. MUMBAI EYE CARE CORNEA AND LAISK CENTRE. NO FINANCIAL DISCLOSURE. Contact Lens in Extreme Ectasia . Old wine in a new bottle!. Rose K - XL. Semi Scleral and Scleral CL. Hybrid CL. Topography Based Traditional CL Fitting Guide. Section 1 . Mirrors. A. . Light is necessary for eyes to see. 1. . Light waves spread in all directions from a light.. 2. . The brain interprets light waves as traveling in a straight line.. B. Plane mirror. identify & use different types of cameras & lenses. COURSE DESCRIPTION . This course is designed to introduce students to the fundamentals of commercial photography in relation to seeing photographically, operating cameras, use of light, image capture, and processing digital images. Students will also learn the history of photography, legal and ethical issues related to the industry. Career exploration is also a part of this course. . How do eyeglasses correct your vision?. When you look in a mirror, where is the face you see?. In which ways is a cell phone camera similar to a human eye?. © 2014 Pearson Education, Inc.. Plane mirrors. Jim Schwiegerling PhD. College of Optical Sciences. University of Arizona. Tucson, Arizona. Euclid. Raphael’s . School of Athens. Euclid ~300BC. Greek mathematician. His book . Elements. used to teach geometry for over 2000 years.. SPECTACLES. EARLY TIMES. 9th Century BC. Possible use of some form of magnification by engravers producing find hieroglyphics on stone.. 1st Century AD. The Roman emperor Nero is said to have used an emerald to view events in the Colosseum. It is not known whether he used the stone as a sun glass or if he was myopic and the stone had a concave surface..