it is repeated observations that confirm "opinions," which we make from the perceptions, but the perceptions themselves are not "confirming" each other.
I agree, the senses cannot confirm or negate each other.
Perceptions are NOT equal to opinions, and perceptions are never
true orfalse!
62b "Everything observed [by the senses] or apprehended through attention to [mental] perception is true"
(τό γε θεωρούμενον Πᾶν ἢ κατ᾽ ἐπιβολὴν λαμβανόμενον τῇ διανοίᾳ ἀληθές ἐστι)"
Opinions about perceptions can be false, but the perceptions themselves are not false - they must be real because they physically affect us. However, we must think about and judge these "honest" reports of our sensations to figure out the extent that they do, in fact, accurately correspond to external objects and circumstances.
51c "and regarding this [movement of thought in us], if it [Ǝ] is not affirmed or [A] is contradicted, Falsity is produced ¬ if it [E] is confirmed or [∀] is not contradicted, Truth [is produced]"
(κατὰ δὲ ταύτην, ἐὰν μὲν [Ǝ] μὴ ἐπιμαρτυρηθῇ ἢ [A] ἀντιμαρτυρηθῇ, τὸ Ψεῦδος γίνεται ¬ ἐὰν δὲ [E] ἐπιμαρτυρηθῇ ἢ [∀] μὴ ἀντιμαρτυρηθῇ, τὸ Ἀληθές)
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A true opinion is established by the full correspondence of that opinion to external objects and their circumstances. If our opinion is not affirmed or is refuted, it is false; but if our opinion is affirmed or not refuted, it is true.