What is the BC or Base Curve in a Contact Lens Prescription?
Have you ever wondered what the BC or Base Curve in a contact lens prescription means? Don’t worry, you are not alone. Let’s delve into the fascinating world of contact lenses and find out what this mysterious number means.
Understanding Contact Lenses
Contact lenses are a popular alternative to glasses, especially for those who lead an active lifestyle. The lens sits directly on the cornea, the clear front surface of the eye, and provides a corrective vision solution for those who have refractive errors such as nearsightedness, farsightedness or astigmatism.
BC or Base Curve – It’s Not Rocket Science
The BC or Base Curve is the curvature of the back surface of the contact lens. It is an important number as it determines how well the contact lens will fit on the eye. The Base Curve is measured in millimeters and typically ranges from 8.0mm to 10.0mm.
Note: If you are one of those people who has trouble remembering numbers, don’t worry, you are not alone. Just remember that the smaller the number (e.g. 8.0mm), the steeper the curve and the larger the number (e.g. 10.0mm), the flatter the curve.
Why is the BC Important?
The BC is crucial because it determines how the lens will fit on the eye. A contact lens with the wrong BC will not only feel uncomfortable, but it can also lead to serious eye health issues such as corneal abrasions and infections.
Imagine wearing a shoe that is the wrong size – it would be uncomfortable and would cause blisters and sores. The same applies to contact lenses. If the BC is incorrect, it can cause discomfort, redness, and inflammation in the eye.
How is the BC Determined?
When you go for an eye exam, your optometrist will measure the curvature of your cornea using a device called a keratometer. The keratometer measures the curvature of the cornea by shining a light on the surface of the eye and measuring the reflection.
Once your optometrist has determined the curvature of your cornea, they will choose a contact lens with a base curve that closely matches the curve of your eye. Of course, there may be some trial and error involved to get the right fit, but your optometrist will work with you to find the perfect lens.
The Final Word
The BC or Base Curve may seem like a small detail, but it is an important factor in determining how comfortable and safe your contact lenses will be. It’s important to follow your optometrist’s prescription and advice to ensure that your contact lenses are a perfect fit for your unique eye shape and curvature.
Remember, contact lenses are a fantastic alternative to glasses, but they come with their own set of rules and regulations. Always follow proper eye care practices, including regular eye exams and lens replacement schedules, to keep your eyes healthy and happy.
Now that you know all about the BC or Base Curve in a contact lens prescription, you can impress your friends at your next trivia night, or perhaps even at your next appointment with your optometrist. Happy lens-wearing!