Just a hypothesis, but it may have to do with why the Saint was blind or when they were blinded. Some blind people keep their eyes closed all the time, but some, especially those that used to be able to see, keep them open.
If that were the case, we would see icons of blind saints with either eyes closed or open, depending on whether their blindness was congenital or acquired. The iconographic record does not show this. St Matrona stands out as an exception, and a very recent one at that. The hymns to her all point to the requirement that she be portrayed with her eyes open. Iconography and hymnography go hand in hand. They are counterparts, the visual and verbal expressions of what we believe.
The hymn you posted states that although she was blind her "spiritual eyes" were open. How can one depict spiritual eyes, without having them confused for physical eyes?
Icons depict what is heavenly, perfected and transformed.
As hymns to her attest, her infirmity was a blessing.
I think you need to make up your mind.
Also, a half-naked, emaciated crone with her ribs sticking out is your idea of heavenly, perfected and transformed?