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

Slides:

Advertisements

Similar presentations

Training Presentation

Advertisements

Laser Eye Surgery Technology LASIK. Anatomy of the eye.

Falls prevention. As you get older, so do your eyes This can affect your life in many ways.

Vision after 40. Symptoms Reading is blurred Eye strain/headache Avoiding close work Holding reading materials at a distance.

Goal: To understand multiple lens systems. Objectives: 1)To understand how to calculate values for 2 lens combos 2)To understand the human eye.

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

Vision and occupational health and safety. Looking after your eyes at work Visual comfort Eye protection.

Monovision for Presbyopia Insert name/ Practice name/ Logo here if desired.

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

Rites of Sight Your Second 50 years A Presentation of the American Optometric Association.

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

Biomedical Engineering and the Eye. Raise your hand if you have eyes. Hopefully that was everyone. How many times a day would you say you use your eyes?

Biomedical Engineering and the Eye. Eye Anatomy 3 major categories of eyesight problems 1._____________ 2.Nearsightedness (___________) 3.Farsightedness.

The Camera The single-lens photographic camera is an optical instrument Components Light-tight box Converging lens Produces a real image Film behind the.

5 ERRORS OF REFRACTION Željka Burčul Mentor: A. Žmegač Horvat.

 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

VISION DEFECTS By Urvan & Kester Ria & Vanessa HYPEROPIA MYOPIA VIDEO.

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

+ Caring for Your Eyes By: Irah P To Keep Your Eyes Healthy… Main Point: It is important to protect your eyes from damage and to have regular eye.

VISION DEFECTS.

Eye Disease and Their View. – Color-Blind – Macular degeneration – Cataracts – Diabetic retinopathy – Glaucoma – Presbyopia-refractive error – Diplopia.

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

Refractive Lens Exchange. 2 How the eye works Light rays enter the eye through the clear cornea, pupil and lens. These light rays are focused directly.

Hyperopia Walter Huang, OD Yuanpei University Department of Optometry.

Diabetes and vision. Summary Diabetes facts Changes to the eyes with diabetes Diabetic retinopathy –Background retinopathy –Proliferative retinopathy.

Lesson 3 Our eyes work in a way that is similar to a camera. Like the click of a camera lens, in the blink of an eye images are formed in the process of.

1© Manhattan Press (H.K.) Ltd. The human eye Visual defects and their corrections Visual defects and their corrections 12.3 Properties of vision Visual.

Driving and vision. The importance of good vision for driving can not be overemphasised.

Optometry Profession. Premedical training same as MD or any other pre-doctoral medical profession plus emphasis on more physics and statistics courses.

Eye Conditions HCT II. Amblyopia Lazy eye (amblyopia) is decreased vision that results from abnormal visual development in infancy and early childhood.

Presented by Jessica M. Borges Certified Ophthalmic Technician-JCAHPO HOW DO WE SEE?

Lesson 3 Our eyes work in a way that is similar to a camera. Like the click of a camera lens, in the blink of an eye images are formed in the process.

1 Eye Optics and Refractive Errors By: John J. Beneck MSPA, PA-C.

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

How The Eye Works Insert name/ Practice name/ Logo here if desired.

OBJECTIVE IDENTIFY TYPES OF CORRECTIVE LENSES USED TO CORRECT SIGHT PROBLEMS [COS 5, SAT 10]

Optical Conditions in the Eye. Marmor & Ravin, 1997, p.3. Eye ball.

Optics and Refractive errors correction By Dr. ABDULMAJID ALSHEHAH Ophthalmology consultant Anterior Segment and Uveitis consultant.

Hyperopia and Myopia.

Disorders of the eye. Astigmatism Myopia - nearsightedness Hyperopia - farsightedness Presbyopia Color blindness Cataracts Glaucoma Conjuctivitis.

How We See Chapter *Light enters the eye through an opening called the pupil. The light is refracted by the lens and cornea and creates an image.

Lenses June Today  Lenses  Total Internal Reflection  Lab – Exploring Lenses  Next class:  Telescopes, rainbows & review.

By: Paula Shistel Mr. Holmes’ 6 th Period Anatomy Class.

Cornea- The clear covering at the front of the eye that lets light rays into the eye.

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

Sports Vision. Performance in sports can be enhanced by good vision.

Short-sightedness & Long-sightedness Done by: Timothy Loe 2A320 Science Ace- Thematic Studies.

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.

Task 2 : The Eye Gan Jia Jie 2A409. Short-sightedness/Myopia  It is a condition of the eye where the light that comes in does not directly focus on the.

Eye (Relaxed) Determine the focal length of your eye when looking at an object far away.

You should be able to: Draw ray diagrams for converging and diverging lenses Use the equation 1/u+1/v =1/f for converging lenses Perform.

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

The Eye. The Human Eye The human eye is the optical instrument that helps most of us learn about the external world.

Lenses Convex lenses converge rays of light. Parallel rays converge a fixed distance away from the lens. This is known as the focal length.

Computer Vision Title of presentation AAAAA BBBBB Dddd ffff gggg.

The Human Eye and Vision Optics of the eye (lenses, focusing, etc.) Physiology of the eye (detection of light)

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.

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). 1.

P3 Physics Medical applications Section a) The structure of the eye. The structure of the eye is limited to: ■ retina ■ lens ■ cornea ■ pupil /iris.

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.

Lens Technologies & the Human Eye

Defects in Human Vision

Refractive ERRORS: Myopia, Hyperopia, & astigmatism

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

Presentation transcript:

The Eye Myopia & Hyperopia

Myopia (Shortsightedness) Myopia = Shortsightedness Can see nearby objects (eg reading) Cannot see distant objects (eg blackboard) i.e. Short - sight Why? Light rays focus in front of retina

Causes Genes Lack of outdoor activity Uncorrected refractive errors (eg. Wrong Correction) Poor Eye Care Too much near work Computer Reading Television

Complications Retinal detachment Retina separates from eye Macular degeneration Retina degenerates Cataract Opacity of lens Glaucoma Eyeball fluid pressure higher than normal

Correction

Corrected with a negative lens Lenses can be from contact lenses / glasses Other treatment: LASIK More Severe Myopia = Thicker lens LASIK, correction with a laser Contact Lenses Glasses

Hyperopia (Longsightedness) Similar but not to be confused with Presbyopia Able to see objects far away Unable to see objects nearby Why? Light rays travelling into eye meet beyond the retina

Normal Eye

Hyperopic Eye

Causes Genetic (Children are able to outgrow this as they have flexible lenses) Though to be Old Age (that’s actually presbyopia) Injuries

Correction Glasses Contact Lenses Lens Positive

References Farsightedness. (2010, August 31). PubMed Health. Retrieved June 18, 2012, from 15/ Myopia - Cause and Preventions. (n.d.). Raffles Medical Group. Retrieved June 18, 2012, from articles/health-topics/myopia-causes-and- prevention.aspx