Study sets baseline ERG data for collared scops owls

A new study in Veterinary Sciences sets out baseline electroretinography, or ERG, values for the collared scops owl (Otus lettia), giving clinicians a species-specific starting point for assessing retinal function in this nocturnal raptor. According to the study abstract, the investigators examined 12 eyes from six owls and developed a standardized ERG recording protocol as part of broader pre-release health evaluations. ERG measures the retina’s electrical response to light and is widely used as a non-invasive way to assess visual function, but its clinical value depends heavily on having reference data for the species being tested. (ncbi.nlm.nih.gov)

That gap has been a persistent issue in avian and wildlife ophthalmology. ERG has been described in some owl species, including the little owl and tawny owl, and in other birds such as pigeons, but protocols and response patterns vary by species, ambient adaptation state, and anesthesia or restraint methods. In other words, a normal tracing in one bird may not be normal in another. That makes baseline data particularly important for nocturnal raptors, whose visual systems are specialized for low-light function. Broader comparative work on owl vision has also shown that nocturnality is associated with distinctive retinal adaptations at the molecular and structural levels. (scholarship.miami.edu)

The collared scops owl study appears to fit into a larger research program focused on practical ophthalmic benchmarks for this species. A 2025 paper involving the same species established normative retinal morphology using optical coherence tomography and histology in 10 eyes from six clinically normal owls, identifying a single fovea and reporting reference measurements for retinal thickness and related structures. That work, like the ERG study, was conducted in the context of pre-release assessment and under general anesthesia, underscoring the clinical and conservation setting in which these data are being developed. Conference materials from ICARE 2026 also show the ERG work being presented as “Retinal function assessment using electroretinography in the collared scops owl,” suggesting growing visibility for the findings within zoo and wildlife veterinary circles. (pubmed.ncbi.nlm.nih.gov)

The source abstract says the owls underwent ocular reflex testing and basic ophthalmic examination before anesthesia, followed by routine radiographic and hematological testing. While the abstract provided does not include the full numerical ERG outputs, the main contribution is clear: a standardized recording approach and baseline functional data for a species where clinicians previously had little published guidance. In practical terms, that can help distinguish retinal dysfunction from artifact when evaluating rescued birds with suspected visual deficits, trauma, or unexplained poor post-rehabilitation performance. (icare-conference.com)

Direct outside commentary on this specific paper was limited in the available web results, and no standalone institutional press release surfaced in this search. Still, the surrounding literature points to why specialists may pay attention. ERG is already recognized as a useful, non-invasive tool for investigating retinal function, and prior avian studies have emphasized that test conditions, including mydriasis strategy and anesthesia, can materially affect recordings. That makes any species-specific protocol more than an academic exercise: it becomes part of the quality control needed for real-world interpretation. (pmc.ncbi.nlm.nih.gov)

Why it matters: For veterinary professionals, the study’s value is less about a single owl species and more about what it signals for wildlife diagnostics. Rehabilitation centers, zoological clinicians, and veterinary ophthalmologists often work with sparse reference data, especially for raptors. A validated ERG protocol for collared scops owls could improve confidence in assessing retinal health before release, support case workups when an owl appears neurologically normal but visually compromised, and provide a benchmark for future studies of retinal disease, toxic exposure, or trauma. It also reflects a broader shift toward building the same kind of species-specific evidence base in wildlife medicine that small animal clinicians expect in companion animal practice. (pubmed.ncbi.nlm.nih.gov)

There’s also a conservation angle. Collared scops owls are free-ranging nocturnal birds, and recent species-specific ophthalmic and morphologic work suggests that clinicians and researchers are trying to align diagnostic rigor with release decisions. If visual function can be assessed more objectively, teams may be better positioned to decide whether a bird is fit for return to the wild or likely to struggle after release. That kind of evidence can matter when subtle visual impairment would otherwise be missed on routine exam alone. This is an inference based on the study context and related pre-release assessment literature, rather than an explicit claim from the authors. (pubmed.ncbi.nlm.nih.gov)

What to watch: The key next questions are whether the full paper reports repeatable reference ranges robust enough for clinical adoption, whether other centers can reproduce the protocol, and whether the method is next applied to diseased or injured owls rather than clinically normal birds. If that happens, this paper could become a useful reference point for avian ophthalmology well beyond one species. (icare-conference.com)