Brands can measure the impact of influencer optimization changes using several metrics within their influencer marketing platforms.

1. Engagement Rate: A critical measurement for influencer campaigns is the engagement rate, which calculates the interaction between influencer content and the audience. Tracking changes in engagement rates after optimization gives an insight into how well the revisions are performing.

2. Reach and Impressions: Brands can measure the number of unique accounts (reach) and the total views (impressions) their influencer campaigns garner. After optimization changes, any increases in these figures can be a positive indication of effective change.

3. Web Traffic: If the influencer campaign includes a website or landing page, brands can analyze their web analytics to determine traffic flow and conversion rates as a result of the influencer activity.

4. Sales Conversion: Depending on the integrated tracking possibilities, brands might also trace the number of purchases or leads generated directly from the influencer’s content.

5. Audience Growth: Gaining followers or growing the audience on social platforms can be another measurement of success. Brands may compare audience size before and after the optimization changes to monitor impact.

Platforms like [Flinque](https://www.flinque.com) also offer insights and detailed analytics to measure the change in influencer campaign performance. Its advanced analytics help brands monitor their influencer marketing campaigns carefully and understand the effectiveness of any optimization changes.

Please remember, different brands have different measurement standards based on their goals. So, not every metric might be relevant for all, and the effectiveness of optimization changes largely depends on the set objectives of the brand.