Guide:Resolving double vision

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Help! I'm seeing double! Actually, double vision is a good sign your vision is improving and is a normal step between blur and clarity, especially at lower diopters.

What's happening

The eyes are designed to optimize vision, adapting based on environmental feedback.[1] This is a normal thing that the eyes do from early childhood.[citation needed] The eyeball changes shape and size to optimize the focal plane while the visual cortex interprets the signal.[citation needed] Returning from lens-induced myopia involves a drastic change to the focal plane, even when it is carried out over a long period of time; the change is larger than anything the visual cortex would have encountered in nature, without lenses.

The change to the size and shape of the eyeball, in response to blur, happens relatively quickly. The double vision is a lag-period where the visual cortex is learning to interpret the changed signal it is receiving; it is learning to "align" the images.

Because the changes to the eye and the brain don't occur at the same pace progression of visual perception is generally experienced as:

Blur > Double Vision > Clarity

Sometimes double vision is difficult to resolve and the visual perception may cycle between double vision and clarity a few times over weeks or months before coming to rest at clarity, especially at lower diopters.[2]

Fusing the images

When you experience double vision you will need to make an effort to resolve it by allowing the visual cortex to fuse the images. This may take a long time when double vision first sets in and much like when you first learn active focus, the fusion will likely be fleeting but will increase in frequency and duration over time.

When to reduce?

Resolving double vision can take time. It is strongly advised not to reduce your correction until double vision is resolved. Reducing before this point will likely result in even worse double vision. Excessive double vision might be an indication that you have reduced too soon or too much. In fact if you are struggling for an extended period of time with double vision that you can not resolve you might consider going back to your previous stronger correction.


  1. Wallman J, Winawer J (2004). "Homeostasis of eye growth and the question of myopia". Neuron. 43 (4): 447–68. doi:10.1016/j.neuron.2004.08.008. PMID 15312645.
  2. The EndMyopia Blog,

2. The EndMyopia Blog: The Giant Double Vision Thread, FAQ Why am I getting Double Vision, Video, Q&A Video

See also

Double Vision