I have astigmatism. Why is it so hard to see at night?

If you have astigmatism, you know that seeing well at night can be a challenge. Why is that?

The problem starts with the shape of your cornea, or the front of your eyeball. Corneas are supposed to be spherical, like a baseball, so that when light passes through the cornea to the retina, the light rays all meet at a single point on the back of the eye. But if you have astigmatism, the cornea is shaped more like a football, and the light rays entering the eye meet at different points causing blurred vision.

At night, or in other low light conditions, the blur gets worse. That’s because when the lighting dims, the pupil dilates to let in more light. As the pupil dilates, or gets larger, more peripheral light rays enter the eye causing even more blur.

nightime

If you’re one of the many people with astigmatism who wear soft toric contact lenses (lenses specifically designed to address the football shaped cornea) you may still experience poor night vision. Halos and glare, especially when driving at night, are common. Why is that? Toric lenses have two powers in them, one for astigmatism, and the other for either nearsightedness or farsightedness. In order to correct your vision clearly, toric lenses should not rotate (turn) on your eye, but oftentimes they do. And that means poor vision.  By evening the problem gets worse because the lenses tend to dry out after a long day of wear. As the dry lens rotates, it can get stuck out of alignment causing serious blurring!

So what is an astigmatic person to do? Try Duette Hybrid Lenses! Duette combines two types of contact lens materials into one unique Duette lens. The rigid center completely covers the cornea’s astigmatism to deliver crisp, clear vision that is not affected by lens rotation. The soft outer skirt delivers all-day comfort, just like a soft contact lens and keeps it stable on the eye, so your vision is consistently crisp and your eyes are comfortable from morning until night.

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