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Lens Cornea Iris Optic Nerve Retina The ‘Normal’ Eye
Light is refracted (or bent) by the cornea and lens Image focuses on the retina A clear image is seen
SCATTERING OF LIGHT Cataract causes Scattering of light
Mature Cataract no light enters the eye
Central Cataract no light enters the eye
INSCISION 2.8 mm OPENING
PHACO PROBE INSERTED
13 mm 6 mm INTRAOCULAR LENS
2.8 mm OPENING
LENS FOLDED 3 mm
FOLDED LENS UNFOLDS
Extra Capsular Cataract Extraction Old or Conventional Surgery
12 mm opening made in the eye
Manually lens removed
Rigid lens inserted
Chapter 14 The Human Eye How Do We See? 8 November 2013.
Lesson Objectives Explain how light travels Explain how we see objects Know how shadows are formed.
Accommodative and Multifocal IOLs Insert name/ Practice name/ Logo here if desired.
ASTIGMATISM. WHAT IS ASTIGMATISM? An optical defect. Vision is blurred. Inability to focus. Cause An irregular curve in the lens.
THE HUMAN EYE Sense organ Gives the sense of sight. Allows us to learn more about the surrounding world.
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#1UNIT C Describes a material which allows light to pass through easily.
Chapter 10 Light. Reflection & Mirrors When light strikes an object It is either reflected, absorbed or transmitted. Opaque: a material that reflects.
© 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their.
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OPTICS of VISION Prof.Dr. Ümmühan İşoğlu-Alkaç İstanbul University, İstanbul Faculty of Medicine Yeditepe University, Faculty of.
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For an eye perfectly in focus, light from a distant star will be imaged on the retina. If the person is ‘looking’ straight at the star, then it will be.
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The Human EYE Parts of The Eye Definitions Tell Me About The Eye/ Teeth.
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UV and your vision. What is UV? Ultra Violet radiation is a component of solar energy Most solar UV radiation is absorbed by the ozone layer More than.
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Function of the Eye 80% of what we perceive is based on sight 3 types of neurons 1) Sensory Neurons –Captures the information coming from the senses (from.
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High School Part 2 /2 by SSL Technologies Physics Ex-53 Click THE EYE The eye is an optical “instrument”. It contains a converging lens used to focus.
Nervous System. Cells of the Nervous System Neurons Dendrites Axons – Schwann cells Synapse Supporting cells – Glial cells – Astrocytes – Oligodendrocytes.
Chapter Menu Lesson 1:What is light?What is light? Lesson 2:Light and MatterLight and Matter Lesson 3:Using LensesUsing Lenses Lesson 4:The Eye and.
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