Theophylact of Bulgaria
Having a body that was already transformed and more divine, He faced no barriers in reaching those with whom He wished to connect. Consequently, the physical appearance of the Savior at that time prevented them from recognizing Him. As noted in Mark (Mark 16:12), He appeared to them "in another form" with different characteristics. His body no longer conformed to the natural laws but existed in a supernatural and spiritual state. It was for this reason that their eyes were restrained, preventing them from identifying Him.
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Why did He take on a different appearance, and why were their eyes closed? This was to manifest their confusion, unveil their wounds, and ultimately provide healing; to present Himself to them in a more endearing manner after a significant period; to teach them from the Scriptures of Moses and the prophets, so that once He was recognized, they could firmly believe that His resurrected body was not universally visible, but was seen only by those to whom He chose to reveal Himself.
Moreover, this experience would grant them the great advantage of not being entirely troubled by uncertainties—such as why He did not rejoin the multitude—but instead reflect on the fact that His life after resurrection differed profoundly from the typical human experience, aligning instead with the divine. This serves as a precursor to the future resurrection, where we shall exist as angels and children of God. Therefore, their eyes were kept from seeing, as He became manifest only to those whom He desired.