I'd honestly be wary of drawing ANY conclusions about competitiveness based on statistically-insignificant little wobbles in the data. I mean, radiology last year had 150 open spots. THAT is indicative of a sharp fall in competitiveness. This is not. Nor is the average matched Step 1 score going from 243 to 244 a sharp rise in competitiveness.
In fact, if you look at the overall pattern and not the individual data points, all we can safely conclude is that 1) overall % match is probably about the same over the past decade, while 2) board scores have continued to creep up, and has continued to ride about 15 points above the national average. To some degree that just follows the same trend you can see in many aspects of higher education -- college admissions, med school admissions, and other "competitive" specialty matches come to mind -- students are scoring higher and packing more extracurriculars into their CVs every year, but it's a slow en-masse drift. Thus, within a given cohort, relative competitiveness in terms of raw % success for any given thing actually isn't changing very much.
Pseudo-statistical babble aside, I really think the takeaway point should be that ophthalmology is, has been, and probably will remain a very competitive field where 25-30% of a very highly self-selected crowd goes unmatched. I just strongly caution against making mountains of molehills because I think the perception of false trends one way or the other can end up misleading people into applying when they realistically shouldn't, or not applying when they realistically should.