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Home » Scleral » What Is the Shape of a Healthy Eye and How Does It Affect Vision?

What Is the Shape of a Healthy Eye and How Does It Affect Vision?

eyes eye care 640x350The human eye is a biological piece of functional art, capable of producing colorful moving three-dimensional images with high precision. At the same time, one can marvel at the aesthetic beauty of the human eye and its shape.

The Shape of a Healthy Eye

In a healthy and perfectly shaped eye, light passes through the cornea and crystalline lens, and is accurately focused onto the retina, located at the back of the gel-filled eyeball. This process enables an image to be passed onto the optic nerve and then the visual cortex of the brain. Accurate focus and convergence depend on the proper shape of each part of the eye. However, eyeballs can be either shortened (hyperopia) or elongated (myopia).

Unhealthy Eye Shapes That Impact Vision

The Myopic Eye

In an elongated myopic eyeball, the distance between the lens and retina is too long, leading the image to come into focus before reaching the retina. As a result, the photosensitive cells of the retina pick up a blurry image.

The Hyperopic Eye

In hyperopia or farsightedness, the opposite is the case. The eyeball is too short, as is the distance that light travels from lens to retina. Therefore, the image comes into focus behind the retina, causing distant objects to appear clear, whereas close ones do not come into proper focus.

The Cornea

While the crystalline lens is flexible and auto-adjusts its shape for proper focus, the cornea is static. A healthy cornea maintains its smooth dome shape. However, if the cornea is weak, the structure of the cornea cannot hold this round shape, causing the cornea to bulge outward and downward like a cone. Perfect curvature of the cornea ensures the correct bending of incoming light onto the lens, whereas inadequate curvature results in a refractive error.

An uneven or irregularly shaped cornea also distorts the image that forms at the retina. Common corneal irregularities include astigmatism and keratoconus.

Keratocoonus Labelled

Scleral Lenses for a Smooth Eye Shape

Scleral lenses are large contact lenses that rest on the sclera — the white part of the eye. The lenses span over the cornea, making them ideal for a deformed cornea as they even out the irregularity to create a perfectly shaped eye.

Contact Dr. Howard Dolman at Dolman Scleral Lens Centre to learn more about how your eye shape affects your vision. We'll be happy to discuss the different correction methods available that offer you sharp, comfortable and clear vision all day, every day.

We receive clients from Kitchener & Waterloo region, Cambridge, Guelph, Stratford, and throughout Ontario.



 

Resources:

https://www.lasikmd.com/blog/eye-shapes-affect-vision

https://www.everydayhealth.com/vision-center/the-healthy-eye/how-the-eye-works.aspx

https://www.nvisioncenters.com/eye-shapes/

https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/refractive-errors

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COVID-19 Changes to Availability

Under the advice of the Chief Medical Officer of Health Ontario, our office is closed to in-person care until further notice as a precaution to help protect our patients, team members and the community against the spread of COVID-19.

Should you experience an eye emergency or concerns about your eye health, please email dec251b@gmail.com or call (519-662-3340).

If you are in need of contact lenses, we offer free direct ship. If you have an eyeglasses emergency, we will do our best to help you.

A team member will be responding to messages and answering the phone between the hours of 10:00 am and 12:00 noon, from Monday to Friday.

We apologize for any inconvenience. Once our office reopens, we will reschedule your appointment.

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We appreciate you patience and understanding during this very difficult time.

Sincerely, and with best wishes,

The Dolman Eyecare Team