Astigmatism is a refractive error that causes blurry vision at various distances. It happens when the cornea or lens of the eye has an irregular shape. Because of this irregular curvature of the eye, light focusses unevenly on the retina, leading to unclear or distorted vision. To correct this error, toric contact lenses are worn. They are specially designed contact lenses for astigmatism that allow the individual to see clearly.
What are contact lenses for astigmatism?
Contact lenses for astigmatism are called toric lenses. They’re designed with different focusing powers in different areas of the lens. This helps light to focus on the retina properly, making vision clearer. They are also designed to stay in the correct position on the eye while you wear them. This is important because if the lens moves or rotates, vision can become unclear again.
Types of contact lenses for astigmatism
There are several types of contact lenses for astigmatism and the right ones are recommended by an optician based on an individual’s needs and lifestyle.
Types of toric lenses based on material
Toric lenses can be grouped into different categories based on the material they are made of:
1. Soft toric lenses: These are made from flexible materials that feel soft and comfortable on the eye. They are easy to get accustomed to and are commonly recommended by opticians for everyday wear.
2. Rigid gas permeable (RGP) toric lenses: These lenses are firm and maintain their shape on the eye, which helps deliver clear vision. They can frequently correct small amounts of astigmatism without requiring a toric design. Toric lenses are available for more challenging prescriptions Individuals may need some time to adjust to them, but they can be effective in correcting higher levels of astigmatism.
3. Hybrid lenses: These lenses combine a rigid centre with a soft outer ring. This design aims to provide the clarity of rigid lenses with the comfort of soft lenses. They are often recommended by an optician when standard soft lenses do not provide sufficient visual clarity.
Types of toric lenses based on replacement schedule
Toric lenses are also categorised based on how often they need to be replaced:
1. Daily toric contact lenses: These are worn once and then disposed of by the end of the day. They are convenient and reduce the need for cleaning.
2. Two weekly or monthly toric lenses: These reusable contact lenses for astigmatism require a proper cleaning and storage routine. Although they are worn daily, two weekly lenses should be replaced every two weeks and monthly lenses should be replaced after a month.
3. Extended wear lenses: Some astigmatism contact lenses can be worn for longer periods, including overnight. However, they should only be worn while sleeping if advised by an eye care professional.
How are contact lenses fitted for astigmatism?
A proper fitting process is essential to ensure clear vision and comfort. An eye care professional performs a detailed eye examination to measure the degree of astigmatism and assess the shape of the cornea.
Trial contact lenses are then used to check how well they sit on the eye. It is important that the lenses remain stable, as the positioning directly affects vision quality. The eye care professional also checks visual clarity after the lenses have been worn. If needed, adjustments are made to the lens power or type. A follow-up appointment is usually scheduled to confirm whether the lenses are suitable for the wearer during regular use.
Tips for wearing contact lenses safely
Taking proper care of your contact lenses is very important for optimal eye health.
- Always wash and dry your hands before touching your lenses
- Follow the cleaning instructions carefully for reusable lenses
- Do not wear lenses longer than advised
- Do not sleep while wearing your contact lenses unless advised otherwise
- Replace lenses as and when recommended
- Do not share your lenses with others
Tina Patel, Contact Lens Optician at Feel Good Contacts, says, “If your eyes look red, feel sore or irritated, it is best to remove your lenses immediately and visit your eye care professional without delay.”
Frequently Asked Questions
How long does it take to get used to toric contact lenses?
Most people get used to them within a few days. However, some may take a little longer, especially if they are new to wearing contact lenses.
Can I wear contact lenses for astigmatism while using a computer?
Yes, you can wear contact lenses for astigmatism while using digital screens, including computers. However, be mindful to blink more often and follow the 20-20-20 rule to avoid dry eyes.
Do I need regular eye examinations if I wear contact lenses?
Yes, regular eye examinations are important to make sure your lenses are still suitable to be worn regularly and your eyes remain healthy over time.
Disclaimer: The advice in this article is for informational purposes only and does not replace medical care or an in-person check-up. Please check with an eyecare professional before purchasing any products or remedies. For information on our article review process, please refer to our Editorial Policy.
Tina Patel is a qualified Contact Lens Optician at Feel Good Contacts with over 25 years of experience in the optical industry. She is a member of ABDO and registered with the GOC. Tina holds a BSc. (Hons) in Optical Management from Anglia Ruskin University and qualified as a Dispensing Optician in 2002. In 2007, she further specialised by completing advanced training in contact lenses, gaining her qualification as a Contact Lens Optician. She now shares her clinical expertise through teaching at City, University of London, guiding future opticians.
