The ranked list in this dataset covers 100 assignees, with the top-ranked company holding 443 records — far ahead of fifth place at 140 and tenth place at 52. The top 5 assignees combined account for 27.7% of all 4,618 records in scope, and the top 10 for 36.6%. Below that concentration, the list runs a long tail of companies with only a handful of filings each, typical of a field with a few established ophthalmic imaging manufacturers and many smaller or one-off entrants.

Filings peaked in 2018 at 335 in a year and have declined since, with the 2021-to-2024 span showing a 61% drop from 318 to 123 records. 2024 is the last year that can be treated as complete; 2025 and 2026 figures will keep rising as publications catch up, since publication typically lags filing by around 18 months. On the evidence available, this reads as a field past its filing peak rather than one accelerating.

A61B (diagnosis and surgery) is by far the largest class, appearing in 79.3% of the 4,618 records in scope. G06T (image data processing) follows at 16.5%, with G02B (optical elements), A61K (medicinal preparations, relevant to dilation-related claims) and G16H (healthcare informatics) each in the 6-7% range. Because a single record can carry multiple IPC codes, these percentages add to more than 100%, and the gap between the hardware-heavy A61B and the thinner informatics classes is the more useful reading than any one number alone.

US20070081127A1, filed by Carestream Health, claims a specific geometric solution for imaging through a small, undilated pupil: a ring aperture conjugate to the cornea combined with an objective lens whose entrance pupil sits between the iris and cornea. Anyone building small-pupil or non-mydriatic imaging optics along this aperture-conjugation approach should check claim scope against this filing specifically, since it is one of the more cited representative records in the set. It does not block image-processing or informatics approaches to the same small-pupil problem, only the described optical geometry.

The clearest gap is in the informatics layer: G16H healthcare informatics sits at only 6.5% of the 4,618 records against A61B's 79.3%, suggesting most claim activity has stayed in optics and hardware rather than in downstream data handling. Illumination uniformity correction, pupil-dilation-free imaging workflows, and operator-training-reducing autofocus are all represented in the underlying search terms but appear thinly in the granted claim record. These are the branches worth checking first before assuming they are already occupied.