What Is Astigmatism?
Astigmatism is a common vision problem usually related to the shape of the cornea. Instead of being evenly curved like a football, it has a more oval, rugby-ball shape. This changes how light enters the eye, preventing it from focusing at a single point on the retina and causing blurred or distorted vision at all distances.
When does it occur?
Astigmatism is often present from birth but can develop at any point in life. It may also occur after an eye injury or eye surgery.
Particular attention is needed in childhood, as a high degree of astigmatism may contribute to amblyopia.
Astigmatism often occurs together with myopia or hyperopia.
What are the symptoms?
Common symptoms include blurred or distorted vision at near and far distances, eye fatigue when reading, headaches and squinting in an effort to see more clearly.
At night, people may notice halos around lights, which can make driving in the dark more difficult.
How is it managed?
Astigmatism can be corrected with glasses or specially designed toric (astigmatism) contact lenses that provide clear vision.
The prescription includes lens power in dioptres as well as cylinder and axis values.
Different hydrogel and silicone hydrogel options are available, including monthly and annual designs. Stability throughout wear is a key feature.
Ask your lens fitter or optometrist which option best suits your lifestyle.
Why stability matters in astigmatism
Astigmatism correction requires the appropriate cylinder and axis. When a toric lens rotates, clarity may come and go. The practitioner observes its position after blinking and assesses vision at useful distances before finalising the parameters.
A useful follow-up visit
Bring lens packaging, prescription details and the care products you use. Describe wearing hours, work environment, activities and previous symptoms. Specific information helps distinguish a fitting issue from dryness, an unsuitable routine or a prescription change and supports a more focused solution.
General information and a personal decision
An article can explain terminology and safe habits, but it cannot diagnose a problem or select a product for an individual eye. Use the information to organise questions. Decisions about prescription, material, replacement schedule and symptoms should follow a professional examination.
The role of a professional examination
A prescription is only one part of a complete assessment. The practitioner considers eye health, tear-film quality and everyday visual needs. Contact lens fitting also involves base curve, diameter, movement and centration. Changing brand, material or parameters requires a new assessment rather than a simple comparison of powers.
A consistent hygiene routine
Wash and dry hands thoroughly before touching a lens or the eye. Keep nails clean, handle the lens with fingertips and prevent product nozzles from touching surfaces. Follow the replacement schedule and never reuse a daily lens after removal. Small, repeatable habits are more reliable than occasional intensive cleaning.
Water and contact lenses
Tap, sea, pool and shower water are not safe for contact lenses. Water can carry microorganisms and alter the lens material. Remove lenses before swimming, showering or using a hot tub, and never rinse a lens or its case with water even when it looks clean.
Caring for reusable lenses
Use only a solution recommended for the lens material. Rub and rinse when instructed, fill the case with fresh liquid and respect the full disinfection time. Never top up old solution. Clean, air-dry and replace the case according to professional guidance, and keep the bottle tightly closed between uses.
Comfort in the real environment
Comfort is influenced by wearing time, screens, reduced blinking, air conditioning, heating, smoke, dust and allergies. Note when dryness or blur appears and discuss the pattern at follow-up. Use only drops compatible with contact lenses and never treat them as a solution for continuing pain or redness.
Frequently Asked Questions: Astigmatism
Astigmatism is a refractive error usually associated with a difference in the curvature of the cornea or lens, causing image distortion.
Blurred or distorted vision at different distances, fatigue, headache and difficulty with night vision are common symptoms.
Yes. Toric lenses have a special design and axis for correcting astigmatism and require an accurate fitting.
Not necessarily. The lens prescription includes fit, curvature, diameter and an assessment of axis stability on the eye.
Arrange a review if visual clarity changes, headaches become frequent or toric lenses do not remain stable and comfortable.
