The Human Eye.

Slides:

Advertisements

Similar presentations

ASTIGMATISM. WHAT IS ASTIGMATISM? An optical defect. Vision is blurred. Inability to focus. Cause An irregular curve in the lens.

Advertisements

Laser Eye Surgery Technology LASIK. Anatomy of the eye.

January 15, 2014 Watch me! According to the National Eye Institute, about ½ of the adults in US have refractive error.

BY P.K.BERA. & N.MAKHIJA.. VIII TO X CLASSES AGE GROUP : 13 TO 15 YEARS.

Characteristics of Lenses Lens  Is a transparent object with at least one curved side that causes light to refract.  Have 2 sides  Either side could.

Content Standard 5 – Contrast ways in which light rays are bent by concave and convex lenses.

Lenses  Lenses display focusing properties because of refraction.  A convex lens will focus a parallel beam of light to a certain point.  A concave.

Thin Lens Equation Distances of virtual images are negative & distances of real images are positive. Heights are positive if upright (above P.A.) and negative.

Homework Set 5: Due Wednesday, March, 17 From Chapter 5: P2, P8, P10, P11, From Chapter 6: P1, P2, P6, PM2,

A PowerPoint Presentation by: Ahmed Hamza & Abdulla Ali.

 Cornea: ◦ Tissue that forms a transparent, curved structure in front of the eye ◦ Refracts light before it enters the eye  Retina: ◦ A layer of cells.

By:Khalid AlNeaimi & Ahmad al sharhan

The Human Visual System The Eye. Anatomy of the Human Eye Cornea Pupil Iris Sclera Retina Optic Nerve Lens.

Pg  The Eyeball The Eyeball  Iris: coloured part of the eye that opens and closes to let in more or less light. In the centre you find.

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.

Physics. PHS 5041 Optics Lenses Lenses are transparent objects with at least one curved surface. Lenses can be: _Convex or converging (***thickest at.

Refraction Phenomena. Apparent Depth & Volume Refraction can change the perception of depth and volume because the apparent path of light does not equal.

Refractive Errors & methods of correction M. F. Al Fayez, MD, FRCS.

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.

Camera No lens Inverted, real image Film or screen.

Hyperopia and Myopia.

A diffraction grating with 10,000 lines/cm will exhibit the first order maximum for light of wavelength 510 nm at what angle? (1 nm = 10-9 m) 0.51° 0.62°

Lens Technologies. Microscopes Invented by Johannes and Zacharias Jansen in 1590 Larger inverted image Used in study of cells and diseases.

Lenses. Applications of Light Refraction What are some common applications of the refraction of light? Cameras Microscopes Lenses Eyeglasses Human eye.

Light – Part 3 Defects in Seeing Year 7 Science. Review from last lesson We learned in our last lesson about the major parts of the eye and their function.

Keloysius Mak. Non-Myopic Eye  Light converges on the retina, producing a clear and sharp image.

Chapter 2 Section 4 Seeing Light.

Vision. Normal Vision light is focused directly on the retina - can see clearly both near & far.

L 33 Light and Optics [3] images formed by mirrors

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.

Lens Applications.

Astigmatism HCT II. Astigmatism An abnormal shape or curvature of the cornea that causes blurred vision. ◦This causes light rays to focus on multiple.

The Eye Myopia & Hyperopia. Myopia (Shortsightedness) Myopia = Shortsightedness Can see nearby objects (eg reading) Cannot see distant objects (eg blackboard)

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 human eye and colorful world

Section first # represents how far away from the chart the person can stand and still be able to read a particular line second # is how far away.

Topic 4: Lenses & Vision. A lens is a curved piece of transparent material (glass/plastic). When light rays pass through it, the light is refracted, causing.

L 31 Light and Optics-3 Images formed by mirrors

The Human Eye; Corrective Lenses

Camellia Gardens Eye Center

Lenses and Vision Topic #4.

L 32 Light and Optics [3] images formed by mirrors

The Human Eye Extension.

Lens Technologies & the Human Eye

Myopia (nearsightedness) and hyperopia (farsightedness). A

L 33 Light and Optics [3] Measurements of the speed of light 

L 31 Light and Optics-3 Images formed by mirrors

DAYAL HOSPITAL.

C-Notes: Anatomy of the EYE

Defects in Human Vision

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.

Notes: Structure of Eye

Lenses Chapter 5.

How are our eyes and cameras similar to each other?

Chapter 12 Review Light and Vision.

L 32 Light and Optics [3] Measurements of the speed of light 

Vision Near and far.

Refractive ERRORS: Myopia, Hyperopia, & astigmatism

Convex Lenses Thicker in the center than edges.

Physiology of Vision Physics of vision

Human Eye Structure of Human Eye: Focusing Eye defects

L 33 Light and Optics [3] Measurements of the speed of light 

L 31 Light and Optics-3 Images formed by mirrors

L 33 Light and Optics [3] images formed by mirrors

6. Ciliary muscles -- system of muscles that attach to the periphery

Vision Problems.

Presentation transcript:

The Human Eye

A colossal squid has eyes that can be over 40 cm (more than 1 ft!) in diameter. That’s 100X larger than a human eye!

Comparing the Eye to A Camera

How the Human Eye Focuses The ciliary muscles make the lens shorter & thicker to focus on nearby objects.

Myopia (near-sightedness) The eye cannot focus on distant objects because the eyeball is too long.

diverging lens

The eye cannot focus on nearby objects because the eyeball is too short.

converging lens

A condition where the lenses of the eyes become stiff & the ciliary muscles can no longer make the lenses change shape. As a result, people with presbyopia cannot focus on nearby objects.

If a near-sighted person develops presbyopia, they will need to wear bifocals.

Astigmatism Blurred vision that is usually caused by a cornea that is oval rather than rounded.

LASIK (laser eye surgery) is an alternative to eyeglasses or contact lenses for patients with myopia, hyperopia, or astigmatism. This procedure involves reshaping the cornea with laser light.

Night-Vision Devices