Ishara Mills-Henry, Ph.D. MIT. Human Eye Cows versus Humans What can they see and what can we see?

Slides:



Advertisements
Similar presentations
The Eye SNC2D.
Advertisements

Focussing Light onto the retina
Topic 4: Lenses and Vision
L 31 Light and Optics-3 Images formed by mirrors
The Human Eye
Review – for marks! 1) What is the difference between a mirror an a lens? 2) Why do you think we have a lens in our eye instead of a mirror?
The Eye and Sight Contrast ways in which light rays are bend by concave and convex lenses. Describe how a prism forms a visible spectrum Explain why different.
Lenses  Lenses display focusing properties because of refraction.  A convex lens will focus a parallel beam of light to a certain point.  A concave.
Parts of the Eye - Pupil.
Imaging Science FundamentalsChester F. Carlson Center for Imaging Science The Human Visual System The Eye.
Dr. Jie ZouPHY The Human Eye Fundamental elements of an eye: –Cornea: light enters the eye through the transparent outer coating of the eye. –Aqueous.
LENSES.
L 33 Light and Optics [3] images formed by mirrors –plane mirrors –curved mirrors Concave (converging) Convex (diverging) Images formed by lenses the human.
The Human Eye. The human eye is similar to a camera!! Light enters through an opening, is focused through a lens, passes through a light-tight (dark)
The Human Visual System The Eye. Anatomy of the Human Eye Cornea Pupil Iris Sclera Retina Optic Nerve Lens.
Application of Lenses Lenses in Eyes
12.3 Lens Technologies and the Human Eye
The eye. A sensory organ that facilitates sight It allows light that passed over objects to enter in specific quantities into it As the light enters the.
Sensory System. 1B3 Sensory System OB30locate the main parts of the eye on a model or diagram and describe the function of the cornea, iris, lens, pupil,
The Human Eye.
Senses- The Eye The human eye is the organ which gives us the sense of sight, allowing us to learn more about the surrounding world (environment) than.
How The Eye Works Insert name/ Practice name/ Logo here if desired.
18.4 Seeing Light Pg
The Eye 5.SEEING LIGHT - THE EYE Cornea -does most of the focusing Iris - Pupil - has the eye color and controls light intensity Lens - the hole in.
VISION the sense we rely on most often. Photoreceptors in the eye are sensitive to wavelengths of light energy called the visible spectrum.
Disorders of the eye. Astigmatism Myopia - nearsightedness Hyperopia - farsightedness Presbyopia Color blindness Cataracts Glaucoma Conjuctivitis.
Human Eye  A human eyeball is like a simple camera! Sclera: White part of the eye, outer walls, hard, like a light-tight box. Cornea and crystalline lens.
3.04 Functions and disorders of the eye
Cornea- The clear covering at the front of the eye that lets light rays into the eye.
The Eye Structure. External Parts of the Eye (Tear Duct)
The Eye. Cross-section of an eye muscle optic nerve aqueous humour lens pupil iris cornea ciliary muscle vitreous humour blind spot retina sclera.
Receptors Receptors are part of the co-ordination system that detect the changes of the environment by means of stimuli. Two types... Interoceptors – receptors.
Lenses. Applications of Light Refraction What are some common applications of the refraction of light? Cameras Microscopes Lenses Eyeglasses Human eye.
The Eye and Sight Describe the relationship between the structure of the eye and sight Contrast ways in which light rays are bent by concave and convex.
Lenses. Diverging and Converging Lenses Double Convex lenses focus light rays to a point on the opposite side of the lens. Double Concave lenses diverge.
The Human Eye. A convex lens is the type of lens found in your eye. The lens takes light rays spreading out from objects and focuses the light, through.
Chapter 9 - The eye $100 $200 $300 $400 $500 $100$100$100 $200 $300 $400 $500 Eye Anatomy Eye Physiology More Parts of the Eye Eye Problems More Vocab.
Human Perception of Light
L 33 Light and Optics [3] images formed by mirrors
Chapter 12 Review Light and Vision. Category: The Eye Give the name and function of the eye part indicated by #3 (the thin layer between #1 and #2). Choroid.
The Eye and Sight Chapter 12. Vision begins when light rays are reflected off an object and enter the eyes through the cornea, the transparent outer covering.
March 31, 2015 Complete Transparent/Translucent/Opaque WS Take out NASA picture (from Friday) Homework: Read & take notes on chapter 23, section 3 (last.
Sensory Physiology The Vision Accommodation Blind spot.
Human Vision Outcome C4 – Explain how human vision works.
Lenses and Our Eyes.
Construction of Human Eye –iris, pupil, cornea, aqueous humour, lens, ciliary muscle, vitreous humour, retina Focusing –seeing near object ( near point.
Structure of Human Eye: –Eye Muscles, Optic nerve, sclerotic coat –Cornea, iris, pupil,, lens, retina, blind spot –aqueous humour, vitreous humour, ciliary.
Convex and Concave Lenses
Minds-on. The Human Eye The Eye vs. the Camera The EyeThe Camera Opens and closes to adjust the amount of light that enters The IrisThe diaphragm.
Seeing Light Chapter 2 Section 4. Vocabulary Cornea – the clear tissue that covers the front of the eye Cornea – the clear tissue that covers the front.
Eye Structure and Seeing Light. The eye is like a camera: Light enters, is focused on a surface, and a picture is made. Light enters your eye through.
Parts of the Eye. Cornea: protects the inner eye whilst letting light in Aqueous Humour: clear and colorless liquid that supports the shape of the cornea.
The Human Eye LG: I can describe the parts and function of the human eye and describe the types of images we observe and the reasons for common vision.
P3 Physics Medical applications Section a) The structure of the eye. The structure of the eye is limited to: ■ retina ■ lens ■ cornea ■ pupil /iris.
The Eye.
The Eye The sensory receptors in your eye detect light energy. The receptors are stimulated by light rays, which enter your eyes after bouncing off objects.
The Human Eye Focus and Vision Correction. Path of Light Cornea Cornea Pupil Pupil Lens Lens Vitreous humor Vitreous humor Retina Retina Optic Nerve (electrical.
The Special Senses Vision (sight) Gustation (taste) Olfaction (smell) Hearing Equilibrium (balance) Chapter 17.
Unit 3 Lesson 4 Light Waves and Sight
HOW WE SEE!.
The Human Eye and Vision
Notes: Structure of Eye
The Eye and Sight Describe the relationship between the structure of the eye and sight Contrast ways in which light rays are bent by concave and convex.
Goal 8- The Eye Understand how we see    . Goal 8- The Eye Understand how we see    
Week 9: Seeing Light CHAPTER 4, SECTION 4 Page 125 – 128.
Unit 3 Lesson 4 Light Waves and Sight
The Human Eye.
The Eye.
Presentation transcript:

Ishara Mills-Henry, Ph.D. MIT

Human Eye

Cows versus Humans What can they see and what can we see?

External Tissue of Eye Rene, C. Eye 20: ; (2009) Cow Eye Human Eye Orbit

Eye movements from Pinna B & Spillmann L (2002) A new illusion of floating motion in depth. Perception 31:1501–1502.

Cow Eye

Cornea – Refractive Errors Pictures taken from

Myopia – Nearsightedness Hyperopia - Farsightedness Pictures taken from

Corrective Lenses Myopia concave lens will correct the problem by focusing the light farther onto the surface of the retina. Hyperopia a convex lens will refract light rays allowing them to focus directly onto the retina.

Lasik

Iris and Pupil Pupil changes size to adjust for light levels (like an aperture)

Let’s take a peak inside…

Lens

Accommodation Close one eye and stare at a point about 20 feet away. Keep focusing on the point and raise one of your fingers into your line of sight just below the point. How does your finger look? Now, change focus: look at the tip of your finger instead of the point 20 feet away. How does the distant image look?

Accommodation Far Away Objects – The zonule fibers provide tension to the lens giving it an elongated shape. Close Objects – Ciliary muscles contract Relaxes the tension of the lens leading to a rounder shape changing the focal length of the eye. This brings objects that are closer to the eye into focus.

Presbyopia Limited lens accommodation

Cataract

Retina

Color Vision

Optic Nerve Where’s my blind spot? Why is it so hard to find?

Where’s my blind spot?

Why is it so hard to find? Right Eye Left Eye

Glaucoma

Bloodshot eyes Inflammation of blood vessels on sclera (white of eye) Causes Conjunctivitis (pink eye) Dry eye Eye strain Alcohol induced

Why more men than women? 1 in 12 people have some sort of color deficiency. About 8% of men and 0.4% of women in the US. Some types of color vision deficiency are sex–linked diseases

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2024 SlidePlayer.com Inc. All rights reserved.