Can hyaluronic acid filler injected into the orbicularis muscle correct scleral show? (Photo)

You're correct in your understanding that HA fillers can be used in this context. The injection of HA fillers into the lower eyelid region, including the orbicularis oculi muscle, is a minimally invasive technique that has been used to help manage lower eyelid retraction and scleral show.
However, it's important to note that this procedure should be performed by an experienced injector, such as a plastic surgeon or dermatologist, due to the sensitive nature of the area and the proximity to the eye. The procedure's success can depend on the injector's skill and experience.
Moreover, while HA fillers can provide temporary improvement, they are not a permanent solution. The body naturally breaks down HA over time, so repeat injections will be necessary to maintain the results.
Always remember that while HA fillers are generally safe, they are not without risks. Potential complications include bruising, swelling, asymmetry, lumpiness, and in rare cases, more serious complications such as infection or vascular occlusion.

Hyaluronidase acid filler addition to the orbicularis oculi muscle will not help with the scleral show, but in fact, may exacerbate the condition by adding weight to the lower eyelid. In order to get rid of the scleral show, you need to build good cheek support. I hope this helps and good luck from New York City Plastic Surgery.