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(519) 941-6761
info@orangevilleoptometrists.ca
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        • Glaucoma Overview
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        • Importance of Complete Eye Exams
        • Glaucoma Description
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        • How to Apply Eye Drops
        • Introduction to the Eye
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        • Macular Degeneration Prevention Overview
        • Importance of Complete Eye Exams
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        • How to Apply Eye Drops
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        • Macular Degeneration: Wet Form
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        • Vitreous Detachment
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        • Stye
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        • Chalazion
        • Blepharitis
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        • Amblyopia Overview
        • Corneal Abrasion Treatment
        • Corneal Cross Linking
        • Vitreous Floaters
        • Strabismus Symptoms
      • Regractive Errors Video Collection
        • Presbyopia Treatment
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        • Hyperopia Treatment
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        • Myopia Causes
        • Myopia Description
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Laser eye surgery Orangeville Laser eye surgery Orangeville
Laser eye surgery Orangeville
  • Home
  • About
    • Dr. Jack DiBerardino
    • Dr. Elizabeth Rutyna
    • Dr. Darren Leblanc
    • Dr. Hannah Wong
    • Dr. Phil Patafio
    • Dr. Catrina Costanzo
    • Dr. Mathew Silva
  • Shop
  • Services
    • Comprehensive Eye Examination – What To Expect
    • About Your Eye Exam
    • Contact Lens Services
    • Low Vision Assessment
    • Laser Vision Assessment
    • Eye Glasses Dispensary
  • Products
    • Eyeglasses
    • Contact Lenses
    • Contact Lens Education
  • Events
  • Technology
    • Optomap Retinal Imaging
    • Corneal Topography
    • Pachymetry
    • Visual Field
    • Advanced Glaucoma Detection Technologies
    • OCT: Optical Coherence Tomography
  • Library
    • Vision Library
      • Amblyopia
      • Age-related Macular Degeneration (AMD)
      • Astigmatism
      • Blepharitis
      • Cataracts
      • Dry Eye
      • Flashes and Floaters
      • Glaucoma
      • Hyperopia
      • Keratoconus
      • Myopia
      • Presbyopia
      • Strabismus
    • Video Library
      • Macular Degeneration Video Collection
        • AMD Prevention
        • Introduction to the Impact of Macular Degeneration
        • Macular Degeneration Prevention Overview
        • How to Apply Eye Drops
        • Intravitreal Injections
        • Laser Surgery – AMD
        • Vision Over 60: Conditions
        • Vision Over 60: Treatments
      • Dry Eye Video Collection
        • Dry Eye Risk Factors
        • Dry Eye – Tear Osmolarity
        • Dry Eye – Testing
        • How to Apply Eye Drops
        • Introduction to the Eye
        • Meibomian Gland Dysfunction
        • Vision Over 40
        • Vision Over 60: Conditions
      • Eye Surgery Video Collection
        • Cataract Surgery: Technologies
        • Cataract Laser Surgery
        • Cataract Surgery – Post-Op
        • Cataract Surgery – Traditional
        • Corneal Cross Linking
        • Corneal Inserts
        • Corneal Transplant
        • Cryotherapy
        • DSEK
        • Glaucoma – Introduction to Surgery
        • How to Apply Eye Drops
        • Intravitreal Injections
        • IOL – Accommodative
        • IOL – Aspheric
        • IOL Overview
        • IOL – Monofocal
        • IOL – Multifocal
        • IOL: Premium Lens Overview
        • IOL – Premium (Mixing Implants)
        • IOL – Toric
        • Laser Therapy
        • Pneumatic Retinopexy
        • Refractive Lens Exchange
        • Scleral Buckling
        • Vitrectomy
        • YAG Laser Capsulotomy
        • Refractive Surgery
        • Vision Over 60: Treatments
      • Glaucoma Video Collection
        • Glaucoma Overview
        • Open-Angle Glaucoma
        • Importance of Complete Eye Exams
        • Glaucoma Description
        • Glaucoma Introduction
        • Glaucoma – Introduction to Surgery
        • Glaucoma – Types (Closed-Angle)
        • Glaucoma: Exfoliation Syndrome
        • Narrow-Angle Glaucoma
        • How to Apply Eye Drops
        • Introduction to the Eye
        • Vision Over 60: Conditions
        • Vision Over 60: Treatments
      • Healthy Vision Video Collection
        • Macular Degeneration Prevention Overview
        • Importance of Complete Eye Exams
        • Contact Lens Care and Compliance
        • Cornea
        • How The Eye Works
        • How The Tears Work
        • Introduction to the Eye
        • Sunglass Lenses
        • Healthy Vision
      • LASIK Video Collection
        • Refractive Surgery
        • PRK
        • Myopia
        • Monovision
        • Wavefront: Custom LASIK
        • LASEK
        • Introduction To Refractive Errors
        • Phakic ICL
        • Hyperopia Description
        • How to Apply Eye Drops
        • Epi-LASIK
        • Dry Eye Risk Factors
        • Astigmatism Description
      • Optical Video Collection
        • Variable Tinted Lenses
        • U.V. Filter
        • Sunglass Lenses
        • Progressive Lenses
        • Polarized Lenses Water
        • Polarized Lenses Driving
        • Polycarbonate Lens
        • High-Index Lenses
        • HD Lenses
        • Anti-Reflective Lens Treatment
        • Frame Selection Overview
        • Computer Lens
        • Eyeglass Lens Options
      • Retina Video Collection
        • Retina
        • Retinal Holes
        • Retinal Detachment
        • Optic Neuritis
        • Macular Pucker
        • Lattice Degeneration
        • Intravitreal Injections
        • Vitreous Floaters
        • Diabetic Retinopathy
        • Cryotherapy
        • Choroidal Nevus
      • Anatomy Video Collection
        • Importance of Complete Eye Exams
        • Zonules
        • Tear Layer
        • Sclera
        • Conjunctiva
        • Choroid
        • Vitreous Body
        • Retina
        • Pupil
        • Optic Nerve
        • Macula
        • Iris
        • Crystalline Lens
        • Cornea
        • Ciliary Body
      • Cataracts Video Collection
        • Laser Cataract Surgery
        • Cataract Surgery (Microincision Phaco)
        • Cataract Surgery (Phacoemulsification)
        • YAG Laser Capsulotomy
        • Toric IOL
        • Nuclear Cataracts
        • Multifocal IOL
        • IOL Overview
        • Subcapsular Cataracts
        • Cortical Cataracts
        • Cataracts Symptoms
        • Cataracts Description
      • Macular Conditions Video Collection
        • Macular Degeneration: Wet Form
        • Macular Degeneration: Dry Form
        • Macular Degeneration Symptoms
        • Macular Degeneration Description
      • Other Diseases
        • Pinguecula
        • Fuchs Dystrophy
        • Corneal Abrasion Overview
        • Corneal Neovascularization
        • Conjunctivitis
        • Choroidal Nevus
        • Vitreous Detachment
        • Subconjunctival Hemorrhage
        • Stye
        • Strabismus
        • Pterygium
        • Keratoconus
        • Chalazion
        • Blepharitis
        • Ocular Migraines
        • Amblyopia Overview
        • Corneal Abrasion Treatment
        • Corneal Cross Linking
        • Vitreous Floaters
        • Strabismus Symptoms
      • Regractive Errors Video Collection
        • Presbyopia Treatment
        • Presbyopia Description
        • Astigmatism Causes
        • Astigmatism Description
        • Hyperopia Treatment
        • Hyperopia Description
        • Myopia Causes
        • Myopia Description
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Astigmatism

Vision Library

Astigmatism


What is astigmatism?

Astigmatism is one of a group of eye conditions known as refractive errors. Refractive errors cause a disturbance in the way that light rays are focused within the eye.

View Video
What causes astigmatism?

Astigmatism usually occurs when the front surface of the eye, the cornea, has an irregular curvature. Normally the cornea should be smooth and equally curved in all directions. In astigmatism, the front surface of the cornea is shaped more like a football than a basketball. This abnormality may result in vision that is much like looking into a distorted, wavy mirror. The distortion results because of an inability to focus light rays to a single point.

Astigmatism is not a disease nor does it mean that you have ‘bad eyes’. It simply means that you have a variation in the shape of your cornea. Not all corneas are perfectly curved, just as sets of teeth are seldom perfectly aligned. There are many variations that might occur in the corneal surface. The degree of variation determines whether or not you need corrective eyewear.

The exact reason for differences in corneal shape remains unknown, but the tendency to develop astigmatism is inherited (runs in the family). For that reason, some people are simply more prone to develop astigmatism than others are. Patients with astigmatism wear cylindrical lenses to focus light on the retina.
How Does Astigmatism Affect your Vision?

To fully understand why astigmatism causes a disturbance in sight, it is helpful to understand the process of sight. The clear cornea is situated at the very front surface of the eye and enables light to enter the eyeball. At that point of entry the cornea accomplishes about four-fifths of the focus needed for clear vision, bending light rays towards one another into a point. The lens further refines the refractive work begun by the cornea and directs that point of light towards a precise location on the retina called the fovea. If light is not focused into that fine point, the image that reaches the retina cannot be clearly transmitted to the brain.

When astigmatism is present, the surface of the cornea instead of being spherical is distorted. Therefore, light rays entering the eye are not focused into the fine point needed for clear vision. Rather, some light rays may focus into a point, while other light rays meet either before they get to the retina or actually behind the retina. Usually, astigmatism causes blurred vision at all distances.

Who develops astigmatism?

Astigmatism is a very common problem. Some experts agree that most people have some degree of astigmatism, often present at birth. The degree of astigmatism may remain the same throughout life.

What are the symptoms of astigmatism?

The symptoms of astigmatism include a distortion or blurring of images at all distances – nearby as well as distant. Even though vision may be fairly sharp, when slight degrees of astigmatism are present, the condition may cause headache, fatigue, squinting, and eye discomfort or irritation. Of interest to parents and those who work with children, astigmatism may contribute to poor schoolwork but is often not detected during routine eye screening in schools.

 

How is astigmatism diagnosed?

Astigmatism is diagnosed through the process of a comprehensive eye health examination.

View Video
Your Optometrist will recommend corrective eyewear to help the eye focus in a more effective manner. This can be in the form of spectacles and sometimes contact lenses.

Astigmatism often occurs with the refractive conditions such as nearsightedness or farsightedness. The corrective lenses needed are called cylinders and have greater light bending power in one axis than in others. Your Optometrist will perform precise tests during your comprehensive eye health examination to determine precisely the ideal lens prescription.

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  • Amblyopia
  • Age-related Macular Degeneration (AMD)
  • Astigmatism
  • Blepharitis
  • Cataracts
  • Dry Eye
  • Flashes and Floaters
  • Glaucoma
  • Hyperopia
  • Keratoconus
  • Myopia
  • Presbyopia
  • Strabismus

Orangeville Optometric Centre

31 First Street
Orangeville, Ontario
L9W 2C8

P: (519) 941-6761
E: info@orangevilleoptometrists.ca

Our office is wheelchair accessible.

Office Hours

Mon-Fri: 9:00am - 6:00pm
Sat: 9:00am - 1:00pm

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ABOUT US

Dr. J. DiBerardino, Dr. E. Rutyna & Optometrists are Orangeville Optometrists offering complete eye health care from vision disorders, age-related eye discomforts, and eye diseases including Amblyopia, Macular Degeneration, Astigmatism, Blepharitis, Dry eye, Cataracts, Contact lens fitting, Low Vision Assessment, Laser Vision Assessment, Lasik Surgery, Glaucoma, Hyperopia, Keratoconus, Myopia, Presbyopia, Strabismus, Retinal Imaging, Corneal Topography, Pachymetry, and Visual Field correction.
Serving Orangeville and nearby areas.

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OUR ADDRESS

Orangeville Optometric Centre
Orangeville Optometrists

31 First Street
Orangeville, Ontario
L9W 2C8

Phone: (519) 941-6761
Email: info@orangevilleoptometrists.ca

Mon-Fri: 9:00am – 6:00pm
Sat: 9:00am – 1:00pm

Our office is wheelchair accessible.

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