Purpose. Reading with both eyes comes with a binocular advantage (shorter total reading times and fixation durations in binocular compared to monocular reading), which results from binocular fusional processes. Binocular advantages in reading typically vary with the amount of individual, horizontal heterophoria and thus, we investigated whether prismatic lenses (measured with the MCH method and worn to com- pensate any heterophoria) have a short- or long-term effect on binocular advantages when reading. Material and Methods. We measured the binocular eye movements (Eyelink II) of 54 participants with individual horizontal heterophoria when reading a total of 120 Ger- man-language sentences (1) monocularly, (2) binocularly, (3) binocularly with disparity (corresponding to an MCH prism), and (4) binocularly with disparity after 6 months. In the 6-month interval between measurements (3) and (4), 29 participants wore glasses with prismatic corrections, while 25 participants were considered the control group. Results. Our data showed a clear, significant advantage for binocular reading on all participants. A short-term, individual disparity (analogous to an MCH prism) did not alter this result. An additional tendency towards a greater binocular advan- tage in the “prism group” compared to the “control group” was only observed after using a prismatic lens for 6 months. Additionally, saccade disconjugacy increased slightly and the objective fixation disparity decreased significantly. Conclusion. Individual prismatic corrections (MCH) had an effect on some aspects of the binocular coordination during reading and increased the binocular advantage in our het- erophoric participants after 6 months of wearing prismatic corrections. This delayed effect on fusion during reading is new and calls for further research. Keywords binocular advantage, horizontal heterophoria, binocular vision, reading, binocular coordination