Match Me If You Can by Michelle Willingham

After five unsuccessful seasons, Emma Bartholomew’s stepmother threatens to auction off her hand in marriage. Horrified at the idea, Emma enlists the help of the School for Spinsters to help her find a husband quickly. But she knows that no man will want to wed her after he learns the secret she’s hiding…that she’s practically blind.
Cormac Ormond, the Irish Earl of Dunmeath, is seeking a quick marriage because he desperately wants an heir. He knows he’s dying, and it doesn’t matter what sort of bride he finds, as long as she’s willing to help him.