"visually noticeable" is correct and can be used in written English.
You could use it to describe something that stands out to the eye: The colorful bouquet was visually noticeable from across the room.
In its original state, GNP is dispersed in orientation and exhibits a visually noticeable red color.
The regions of large error (red color in the left column) indicate areas where noise might be visually noticeable.
However, the reduction in the number of keypoints within the destination patch (top centre) is visually noticeable with respect to the authentic image (top left).
When using a constant CR, the reconstructed data exhibits discrepancies and anomalies in the velocity field that are visually noticeable around the flame fronts where sudden variations in the velocity occur.
The spectrograms of the other mixtures are not presented because the differences between any two of them are not visually noticeable since the mixing matrix A involves no null entry.
However, it is visually noticeable that the increase of the rate of deposition and the thickness of the film leads to the increase in the average grain size of the base and in protruding crystallites.
Thus, we began our analysis by screening visually for wells with noticeable changes in the pattern of MSL1 staining.
Finally, quantification of the level and location of detected sliding motion yields visually plausible results by demonstrating noticeable sliding at the pleural cavity boundaries.
First, the study clinician will visually examine the anus for noticeable lesions.
The horse should appear mostly white or light-colored with noticeable — but not visually overpowering — dark spots.
Differences in the b* values were particularly noticeable, which corresponds to the visually observed yellowing.
