This refers to the twentieth year of Jeroboam's reign. AT: "After Jeroboam had been the king of Israel for almost twenty years" (See: [[rc://en/ta/man/translate/figs-explicit]])
The eyes here represent seeing, and seeing represents judgment. Yahweh saw and approved of Asa's actions. AT: "what Yahweh judges to be right" or "what Yahweh considers to be right" (See: [[rc://en/ta/man/translate/figs-metaphor]])