ASTIGMATISM. Astigmatism Astigmatism ASTIGMATISM MEANS THAT THE CORNEA IS OVAL, LIKE A FOOTBALL ASTIGMATISM MEANS THAT THE CORNEA IS OVAL, LIKE A FOOTBALL.

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

Accommodative and Multifocal IOLs
Laser Eye Surgery Technology LASIK. Anatomy of the eye.
Vision after 40. Symptoms Reading is blurred Eye strain/headache Avoiding close work Holding reading materials at a distance.
January 15, 2014 Watch me! According to the National Eye Institute, about ½ of the adults in US have refractive error.
LASIK. LASIK is an FDA- approved outpatient procedure that uses the excimer laser to reshape the cornea to correct your vision. LASIK typically takes.
LASIK Surgery Camellia Gardens Eye Center. What is LASIK? Procedure uses computer controlled laser to reshape cornea Surgical procedure to correct –Myopia.
LASIK Surgery Magnolia Gardens Eye Center. What is LASIK? Procedure uses excimer laser to reshape cornea Surgical procedure to correct myopia, hyperopia,
Lenses The Eye. Iris: the colored part that surrounds the pupil and regulates the amount of light entering the eye. Pupil: the opening of the eye. Cornea:
Refractive Surgery Seminar: An Introduction to Laser Vision Correction Emily Birkholz, MD John Hoines, MD Ophthalmology Associates of Mankato.
Monovision for Presbyopia Insert name/ Practice name/ Logo here if desired.
L 31 Light and Optics-3 Images formed by mirrors
The Human Eye
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.
Homework Set 5: Due Wednesday, March, 17 From Chapter 5: P2, P8, P10, P11, From Chapter 6: P1, P2, P6, PM2,
5 ERRORS OF REFRACTION Željka Burčul Mentor: A. Žmegač Horvat.
L 33 Light and Optics [3] images formed by mirrors –plane mirrors –curved mirrors Concave (converging) Convex (diverging) Images formed by lenses the human.
how does human eye works? Human eye works similar to camera,each part in the human eye plays in a vital role to provide clear vision. So, we can say that.
 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 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.
Intacs Insert name/ Practice name/ Logo here if desired.
+ 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.
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.
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.
THE HUMAN EYE SUAAD MOHAMMAD ERIN OLSON Refraction and Converging Lenses.
{ Eye Diseases and Problems as well as Symptoms and Treatments By Michael Cheung.
Incisional Procedures Insert name/ Practice name/ Logo here if desired.
Eye Conditions HCT II. Amblyopia Lazy eye (amblyopia) is decreased vision that results from abnormal visual development in infancy and early childhood.
How The Eye Works Insert name/ Practice name/ Logo here if desired.
Human Perception of Light
OBJECTIVE IDENTIFY TYPES OF CORRECTIVE LENSES USED TO CORRECT SIGHT PROBLEMS [COS 5, SAT 10]
Community Fellow,.  Vision problems affect nearly 13.5 million children in the U.S.  Students, especially young ones, may not.
Cornea- The clear covering at the front of the eye that lets light rays into the eye.
Human Perception of Light
HEALTHY CHOICES: Your Sense of Sight Ms. Mai Lawndale High School.
Laser Eye Surgery And other surgical vision correction.
Laser Eye Surgery And other surgical vision correction.
Keloysius Mak. Non-Myopic Eye  Light converges on the retina, producing a clear and sharp image.
Vision. Normal Vision light is focused directly on the retina - can see clearly both near & far.
Human Perception of Light
The Vision Test Step 1: Have your nose approximately 1.5 feet from the screen. (Slightly closer than normal distance when working at a computer.) Step.
LASIK Surgery Student Name. What Is LASIK? Surgical procedure to correct myopia, hyperopia, and astigmatism. LASIK is acronym for laser assisted in situ.
L 33 Light and Optics [3] images formed by mirrors
Astigmatism By: Kelly Purcell. What is it? An eye condition characterized by irregular curvature of the cornea.
Lucy Crayton.  Myopia is the medical term for nearsightedness.  Nearsightedness means that you have trouble seeing things in the distance. They appear.
Astigmatism HCT II. Astigmatism An abnormal shape or curvature of the cornea that causes blurred vision. ◦This causes light rays to focus on multiple.
1. The Special Senses allow the human body to react to the environment. 2. The body is able to see, to hear, to taste, to smell, and to maintain balance.
Lasers in Ophthalmology. Anatomy of eye The cornea is a transparent tissue in the front part of the eye. It is a curved spherical structure that is responsible.
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.
FAQ OF LASIK EYE SURGERY
Camellia Gardens Eye Center
Sensory System Issues and Innovations
The Human Eye.
Chapter 27 Ophthalmic Care
L 32 Light and Optics [3] images formed by mirrors
The Human Eye
Dr. James A. Davies, M.D. is the Medical Director of Davies Eye Center and The Surgical Eye Care Center. As a surgical pioneer, Dr. Davies has been recognized.
L 31 Light and Optics-3 Images formed by mirrors
DAYAL HOSPITAL.
Defects in Human Vision
Refractive ERRORS: Myopia, Hyperopia, & astigmatism
L 31 Light and Optics-3 Images formed by mirrors
Chapter 27 Ophthalmic Care
L 33 Light and Optics [3] images formed by mirrors
The Eye and Vision.
Vision Problems.
Presentation transcript:

ASTIGMATISM

Astigmatism

Astigmatism ASTIGMATISM MEANS THAT THE CORNEA IS OVAL, LIKE A FOOTBALL ASTIGMATISM MEANS THAT THE CORNEA IS OVAL, LIKE A FOOTBALL

Astigmatism A normal cornea has spherical shape A normal cornea has spherical shape Most astigmatic corneas have two curves Most astigmatic corneas have two curves Astigmatism often occurs along with nearsightedness or farsightedness Astigmatism often occurs along with nearsightedness or farsightedness

Astigmatism Signs, Symptoms, and Causes Signs, Symptoms, and Causes Blurred vision near and distance Astigmatism is usually hereditary Many people born with an oblong cornea Astigmatism may also result from an eye injury

Astigmatism

Astigmatism Detection and Diagnosis Detection and Diagnosis Astigmatism can be corrected with Astigmatism can be corrected with a. Eyeglasses b. Contacts C. Surgically

Astigmatism

Astigmatism

Astigmatism

Astigmatism test

Astigmatism Test If you do not see all the lined squares, in the same black color, if you do see one or more squares grey, you then have an astigmatism. If you do not see all the lined squares, in the same black color, if you do see one or more squares grey, you then have an astigmatism. ASK FOR A SPECIALIST ADVICE!!! ASK FOR A SPECIALIST ADVICE!!!

Astigmatism Test Close one eye and then the other one

Astigmatism Treatment Most common surgeries used to correct astigmatism are: Most common surgeries used to correct astigmatism are: Astigmatic Keratotomy Astigmatic Keratotomy LAZIK LAZIK The objective of these procedures is to reshape the cornea from oval to spherical or uniformly curved The objective of these procedures is to reshape the cornea from oval to spherical or uniformly curved

Eyelid held open & aligned

flap cut back exposing inner layers

Suction plate

Cornea flattened, inner eyelid of cornea eposed

flap folded back

Tracking ring

Flap returned

Closing the flap

Astigmatism Conclusion: Depending on the type and severity of astigmatism it can be treated and corrected by eyeglasses, contacts, and surgery. In all three procedures the oblong cornea is corrected to its spherical form cornea.

Astigmatism Resources optic.ch/optometric/test optic.ch/optometric/test optic.ch/optometric/test optic.ch/optometric/test

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

© 2024 SlidePlayer.com Inc. All rights reserved.