Kamma done in the past is a given for the vipaka-citta (in this case cakkhu-vinnana) to arise. And here venerable Bodhi is listing some of the conditions that are needed to support/condition cakkhu -vinnana.
So the object is visible object (rūpārammaṇa) and if this is an ugly sight it is the result of an unwholesome kamma done in the past and the opposite for a desirable sight.
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