If you have acuity of vision, it means that you are less likely to wear prescription glasses. The reason is that "acuity of vision" is a term used to refer to the clarity of vision. So, if you possesse acuity of vision, your sight is fine. However, if you have low acuity of vision, it is more likely that you will need prescription glasses.
Explanation: an adverb is a word that serves as a modifier of a verb, an adjective, another adverb, a preposition. so in this case the adverb "gently" is modifying the verb "touch".
