Obviously this thought process could extend well beyond healthy vision.
Retinoid Regulation of Ocular Surface Innate Inflammation
Keynotes
Retinoids are essential for maintaining a healthy, well-lubricated ocular surface and have immunomodulatory effects in the conjunctiva that are mediated in part via RXR-α signaling. Perturbation of the homeostatic retinoid axis could potentiate inflammation on the ocular surface.
Vitamin A is essential for maintaining a lubricated uninflamed ocular surface and clear cornea.
Also another possible mechanism,
The effects of vitamin A compounds on hyaluronic acid released from cultured rabbit corneal epithelial cells and keratocytes
A role of vitamin A in the synthesis of hyaluronic acid by skin cells is well known.
vitamin A also stimulates the release of hyaluronic acid from cultured rabbit corneal epithelial cells and keratocytes.