25 / 09 Monday Kaupapa: Draw and label a diagram showing the structure of eye Describe the functions of different parts of eye.

Slides:

Advertisements

Similar presentations

Light Notes 3 THE EYE.

Advertisements

Anatomy of the eye.. The Eye: The eyes are the organs of the special sense of sight. They sit in the orbit of the skull which provides them with positional.

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,

18.4 Seeing Light Pg

The Cornea Light enters the eye through the cornea

Human Vision. The pupil is the dark transparent region in the centre of the eye where light enters. The iris is the coloured circle of muscle surrounding.

(c) McGraw Hill Ryerson Human Vision The pupil is the dark transparent region in the centre of the eye where light enters. The iris is the coloured.

Year Science. Cornea Transparent outer covering of the eye It is convex in shape to allow the light that passes through it to be refracted Cornea.

SPECIAL SENSES. the human body is very sensitive to conditions in both its internal and external environment the nervous system collects information about.

Cross Section of the Eye Review of Important Terms The outer surface of your eye where light enters is made of a transparent layer of tissue called the.

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.

The Senses & Vision p What are the five senses? 1.Vision 2.Hearing 3.Smell 4.Taste 5.Touch.

The Human Eye. In many ways, the human eye is similar to a camera. Light enters through an opening, is focused through a lens, passes through a light-tight.

1B3 Sensory System. 1B3 Sensory System OB30locate the main parts of the eye on a model or diagram and describe.

Psychology 210 Lecture 4 Kevin R Smith. Vision Sensory System –The eye –Exactly what we sense from our environment Perceptual System –The brain –How we.

The EYE. Layers of the Eye Sclera Choroid layer Retina.

(c) McGraw Hill Ryerson Human Vision The pupil is the dark transparent region in the centre of the eye where light enters. The iris is the coloured.

What do you see?. Do you see gray areas in between the squares? Now where did they come from?

The retina is a layer of light- sensitive cells in the back of the eye.

Human Vision Outcome C4 – Explain how human vision works.

Seeing light When light from an object enters your eye, the eye sends a signal to your brain and you see the object. When light from an object enters your.

Section 12.1 (Part 1) The Human Eye.

Expected Performance: (B.21) Describe the structure and function of the human eye.

Label the Eye – use book pg. 618 Structure & Function: use book pgs Cornea: clear tissue that covers front of eye. Pupil: opening through.

Science in Primary 4 Master Nopphadol Panyadee. A guide to the many parts of the human eye and how they function.

EYE The eye is an extension of the brain.

Light and Your Eyes. You have five human senses that help you function. These senses work together to give you a complete picture of your environment.

Eye Can See Clearly Now. Basic Anatomy The eye is approximately 2.54 cm wide, 2.54 cm deep and 2.3 cm tall.

Color  You see an object as the wavelength  ( color) of visible light that it reflects  Sunflowers are yellow because it reflects (bounces off) mostly.

Corrections. Eye worksheet 1. Choroid 2. Light-sensitive nerve cells, rods and cones or photoreceptors 3. Iris – pupil reflex 4. Sclera 5. A hole – allows.

6.1 Human Vision.  Light enters the eye through the pupil  The iris (the coloured part of the eye) controls the amount of light entering the eye  In.

The iris is the coloured circle of muscle surrounding the pupil.

Process of Eyesight and Hearing

The Eye Part 1: Structure and Function of the Eye.

THE EYE The eye is an amazing and important part of the body. Eyes allow us to see the shape, size, colour, and depth of the world around us. Of all the.

Seeing Colour By the end of this lesson, you will be able to…

By the end of this, you should know:

The Human Eye: Seeing Light

The Human Eye and Vision

The iris is the coloured circle of muscle surrounding the pupil.

The iris is the coloured circle of muscle surrounding the pupil.

7.5.g Students know how to relate the structures of the eye and ear to their functions.

By the end of this, you should know:

The Eye and the Nervous System

The iris is the coloured circle of muscle surrounding the pupil.

Sight How the Human Eye Sees.

Refraction of Light When light rays enter a medium at an angle, the change in speed causes the rays to bend, or change direction Some mediums cause light.

UNIT 3 ~ PHYSICS Lesson P6 Part 1 ~ Human Vision

UNIT 3 ~ PHYSICS Lesson P6 Part 1 ~ Human Vision

Title: The Human Eye LO: 1. Identify the parts of the human eye and state their functions. 3/4/2019 STARTER: What do these have in common?

The Eye Part 1: Structure and Function.

1B3 Sensory System

Unit 2 Notes: Vision.

How your eyes work and the structures that allow us to see

SENSORY SYSTEM FUNCTION OF THE EYE.

Chapter 6.1 Human Vision.

Vocab Terms Section #2.

How do we see? Light reflecting off an object enters the cornea of the eye and then the pupil. The lens then focuses it on to the retina. The retina contains.

Nervous System III Anatomy and Physiology

LIGHT AND SOUND YEAR 9 SCIENCE

Presentation transcript:

25 / 09 Monday Kaupapa: Draw and label a diagram showing the structure of eye Describe the functions of different parts of eye

Do you remember? What are the three things that can happen when radiation hits a surface? What is “refraction”? What is “total internal reflection” Give an example of when total internal reflection is useful

The Eye

Question: How do we “see” things?

Eyes = “Light detectors”

How we “see” things: When we are seeing an object, our eyes are being exposed to the light that is coming from the object. Luminous objects produce light (e.g. the sun), whereas other objects reflect light so we can still see them (e.g. the moon).

The Structure of Eye cornea sclera (white coat) iris lens retina pupil optic nerve

Iris (and Pupil)

Iris Pupil

Iris and Pupil “In dark” “In light” When it’s dark, the Iris opens up and the pupil (the opening) gets larger, so more light can come through the eye.

Lens The lens focuses the incoming light so a clear image can be produced on the retina.

Normal Eye

Myopia (Short sightedness)

Retina. Ophthalmoscope image of a healthy retina (orange) Retina. Ophthalmoscope image of a healthy retina (orange). The blood vessels on the retina are visible through the pupil of the eye. The retina is the light-sensitive membrane at the back of the eye. The pupil is surrounded by the iris (blue), a ring of muscle that contracts or relaxes to alter the amount of light entering the eye. Ophthalmoscope views of the retina can be used to diagnose a range of disorders, including glaucoma, retinal detachment and retinal cancer. Retina

Retina rod cells. Coloured scanning electron micrograph (SEM) of a freeze-fractured section through a retina, revealing the structure of its photoreceptors. Photoreceptors with these rod-like outer parts (green) are named rod cells (rather than cone cells) and contain the protein rhodopsin (visual purple) that aids vision in dim light. The inner parts (orange) lead to the nuclei (blue/red, top). Empty spaces in this layer show Muller cells that provide a fibrous support for photoreceptors. Light triggers signals in the photoreceptors after passing through a neuron layer (above nuclei, not seen). These signals travel to the neurons and on to the brain. Magnification: x3000 at 6x7cm size.

Retina It is the area on the back of the eye covered with photoreceptors which turns the focused image into an electrical signal. The signal is sent to the brain via the optic nerve.

What have we learnt today?