Specialty Vision · Vision Simulator
Astigmatism Simulator — Blurred, Ghosted Vision
Astigmatism is an uneven curvature of the cornea (or lens) that blurs and slightly doubles vision at all distances — very common, and corrected with glasses or contacts.
Overview
A normal cornea is curved like a sphere; in astigmatism it's shaped more like a rugby ball, steeper in one direction than another, so light focuses at two points instead of one. The result is blur with a bit of ghosting or streaking — lines and lights smear in a particular direction — at both near and far. Astigmatism is very common, often occurs alongside myopia or hyperopia, and is corrected with glasses, toric contact lenses or laser surgery.
Symptoms of astigmatism
- Blurred or slightly doubled vision at all distances
- Streaking or 'tails' on lights at night
- Squinting, eye strain or headaches
- Lines and text that look distorted or tilted
- Trouble with fine detail near and far
What causes astigmatism
- The cornea (or lens) is curved more steeply in one direction than another, so light focuses at two points
- Usually present from birth and often inherited
- Can occasionally change after eye injury or surgery, or with keratoconus (irregular astigmatism)
Astigmatism risk factors
- Family history of astigmatism
- Often accompanies myopia or hyperopia
- Keratoconus or corneal scarring (irregular astigmatism)
Treatment
Regular astigmatism is corrected with glasses or toric contact lenses, and laser vision correction reshapes the cornea for suitable candidates. Irregular astigmatism (for example from keratoconus) is best corrected with specialty rigid or scleral contact lenses. An eye exam measures the amount and axis and sets the right correction.
When to see an eye doctor
Blur and ghosting that improve with glasses are routine — an eye exam measures your astigmatism and corrects it. See an eye doctor promptly if vision is progressively distorting (which can signal keratoconus), or if blur comes on suddenly or with eye pain.
Seek urgent care for:
- Progressively worsening distortion or ghosting
- Sudden vision change or one-eyed distortion
- Distortion with eye pain or light sensitivity
Frequently asked questions
What does astigmatism look like?
Vision is blurred with a bit of ghosting or streaking at every distance — lights smear into tails at night and fine lines look slightly doubled or distorted. The simulator shows this directional blur and ghosting.
Is astigmatism serious?
Regular astigmatism is very common and simply corrected with glasses or contacts — not dangerous. Progressively worsening or irregular astigmatism can signal keratoconus and should be checked.
Can astigmatism be corrected with LASIK?
Often, yes — laser correction treats regular astigmatism in suitable candidates. Irregular astigmatism (for example from keratoconus) is usually corrected with specialty contact lenses instead.
Can you have astigmatism and myopia together?
Yes, very commonly. A single pair of glasses or toric contact lenses corrects both at once.
Sources
- Refractive Errors — National Eye Institute
- Astigmatism — Cleveland Clinic