Astigmatism is a condition that is caused by an irregular shape of the cornea – the clear part of the eye that covers the iris and the pupil. The cornea is usually smooth, round, and spherical but in an astigmatic eye, the cornea turns into a shape that is not spherical and develops a second curve. One of the primary duties of the cornea is to focus light onto the retina which enables you to see clearly. When the cornea is out of shape and develops two curves, this created two focal points therefore causing blurred vision.
The irregular shape of the eye makes it hard for traditional contact lenses to fit and provide clear vision and therefore requires specialized contact lenses such as toric lenses or rigid gas permeable lenses (RGPs).
What are Toric Contact Lenses?
Toric contact lenses are designed to correct astigmatism and custom made to fit the eye of the patient. Rather than having a perfectly spherical surface like standard contact lenses, toric lenses have a more oblong shape made to accommodate the shape of the astigmatic eye. Toric lenses can be made of either soft or rigid gas permeable (RGP or GP) lens material, however the soft toric lenses are more common.
Toric contact lenses are also designed in such a way that the lenses stay in place on the eye to maintain proper vision. Sometimes as the eye moves or blinks the lens can rotate considerably on the eye. If this rotation continues with a soft toric lens, a rigid gas permeable lens might be more effective. Rigid gas permeable lenses have a longer initial adjustment time, but once this has passed they are usually just as comfortable as soft contact lenses and they are often easier to care for.
Toric lenses are available in every wearing schedule from daily disposable to long-term wear. In some cases you may even find colored toric contact lenses. Due to the customization required, toric lenses tend to be more expensive and may take more laboratory time to make than traditional lenses.
If you have astigmatism, finding the right fit for your contact lenses is essential. Speak to your eye doctor today for a full assessment to determine which type of toric lenses will work best for you to help you see and feel your best.
Dr. John is a 2020 graduate of The Ohio State University with a major in microbiology and received his Doctor of Optometry degree with honors from The Ohio State University in 2024. While in optometry school, Dr. John completed his ocular disease rotation at the Chillicothe VA Medical Center where he saw and managed glaucoma, age-related macular degeneration, diabetic retinopathy, and optic neuropathies. He also enjoyed his time in the Binocular Vision/Pediatric clinic and Contact Lens clinic fitting all types of soft and specialty contact lenses. He is now a member of the Ohio Optometric Association and the American Optometric Association. Dr. John grew up in Lancaster, Ohio where he enjoyed competing in sports and spending time outdoors. He is excited to begin his career in optometry and join the Chester Eye Center team.