- Treatments & Services
- Consultants & Specialists
- Our Clinic
- Patient Information
- Funding Your Treatment
- Optom & GP Zone
- Contact Us
The visual disorders (called refractive errors) that require you to wear glasses or contact lenses to correct shortsightedness, long-sightedness or astigmatism are the most common vision problems worldwide. Refractive errors occur when the curve of the cornea is irregularly shaped (too steep or too flat) or too short or long.
When the cornea is of normal shape and curvature, it bends, or refracts, the light on to the retina with precision. However, when the curve of the cornea is irregularly shaped, the cornea bends light imperfectly on to the retina. This affects good vision.
The goal of glasses, contact lenses and refractive surgery is to correct or improve these errors by helping images to focus closer to wall or onto the retina.
The refractive process is similar to the way a camera takes a picture. The cornea and lens in your eye act in the same way as the camera lens. The retina is similar to the film. If the image is not focused properly, the film (or retina) receives a blurry image. The image that your retina sees then goes to your brain, which tells you what the image is.
Myopia or shortsightedness occurs when the eye is too long or the cornea is curved to steeply. Far away objects will appear blurry because they are focused in front of the retina. Myopia effects over 25% of all adults.
Hyperopia or long-sightedness of occurs when the eye is too short or the cornea is too flat. Distant objects are clear, and close-up objects appear blurry. With hyperopia, images focus on a point behind the retina.
Astigmatism occurs when the cornea is not round like a football but curved more like a rugby ball. The uneven curvature of the cornea blurs and distorts both distant and near objects. This causes light rays to have more than one focal point and focus on 2 separate areas of the retina, distorting the visual image. Two-thirds of people with myopia also have astigmatism.
When you are young, the lens in your eye is soft and flexible. Then the lens of the eye changes its shape easily, allowing you to focus on objects both close and far away. The refractive error known as presbyopia begins to occur in most people around the age of 40 when the lens of the eye begins to lose its elasticity.
It is a normal ageing process, that occurs in everybody, which makes it difficult to focus on near objects or more difficult to read at close range and is usually corrected with bifocals or reading glasses. You can have presbyopia in combination with myopia, hyperopia or astigmatism.
There is no best method of correcting a refractive error. The most appropriate correction for you will depend upon your eyes, your lifestyle and your age. Refractive errors can be corrected with glasses (single focus, bi-focal, tri-focal or variable focus), contact lenses (generally soft or gas-permeable) or refractive surgery.
The decision for which one of these to opt for will depend on the advice that you receive from your optometrist, your ophthalmologist and your family practitioner.
|The adiLP cookie is used to help track visitors who have multiple tabs open in the same browser to prevent errors in tracking.
|This cookie is set by software from ResponseTap. The software provides website owners with the ability to link website visitor behaviour to telephone calls made to the company as the result of a visit, in order to understand the effectiveness of the website in encouraging calls from customers.
|The adiV cookie contains an identifier which is used by AdInsight to track a visitor over time. This allows AdInsight to show multiple visits made by a customer over time from the same browser.
|The adiVi cookie contains an identifier which is used by AdInsight to help track a visitor’s path while they are on the website.
|This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
|This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Non-necessary".
|The cookie is set by Facebook to show relevant advertisments to the users and measure and improve the advertisements. The cookie also tracks the behavior of the user across the web on sites that have Facebook pixel or Facebook social plugin.
|General-purpose platform session cookies that are used to maintain users' state across page requests.
|This cookie is used to a profile based on user's interest and display personalized ads to the users.
|This cookie is native to PHP applications. The cookie is used to store and identify a users' unique session ID for the purpose of managing user session on the website. The cookie is a session cookies and is deleted when all the browser windows are closed.
|This cookie is set by WordPress. The purpose of the cookie is to determine if the users' browser supports cookies.
|This cookie is set by Facebook to deliver advertisement when they are on Facebook or a digital platform powered by Facebook advertising after visiting this website.
|This cookie is installed by Google Analytics. The cookie is used to calculate visitor, session, campaign data and keep track of site usage for the site's analytics report. The cookies store information anonymously and assign a randomly generated number to identify unique visitors.
|This cookie is installed by Google Universal Analytics to throttle the request rate to limit the collection of data on high traffic sites.
|This cookie is installed by Google Analytics. The cookie is used to store information of how visitors use a website and helps in creating an analytics report of how the website is doing. The data collected including the number visitors, the source where they have come from, and the pages visited in an anonymous form.