How do floaters affect visual acuity? Does prescription change after treatment?
Most of the time after treatment, there is not an improvement or overall change in Snellen Chart visual acuity. This is the testing that most are familiar with: small, high-contrast letters 20 or so feet away. This vision is usually noted as 20/20 or 20/something in the US. This only tests the central (albeit most important) visual acuity. There are other aspects of vision such as contrast sensitivity, color, peripheral, and a vague and harder to quantify “quality of vision”. For instance, you could have 20/15 vision by the chart. Excellent vision, right? But what if you have advanced glaucoma with tunnel vision? Or in the case of floaters, what if you have swirling soup moving about with every eye movement. It may be 20/15, but who cares if you have that junk moving around in your eye. Occasionally there is a dense, stable floater stuck right in the middle of the visual axis. With treatment we have seen improvements of up to four lines of vision after a series of treatments. That situ
