Ms. Motta is a Registered Veterinary Technician and Registered Lab Animal Technician at the School of Veterinary Medicine, University of California, Davis. Her research interests include corneal wound healing, myopia and Keratoconjunctivitis Sicca. She has additional training in industry and grant project development and design, high resolution imaging and acquisition and clinical trial design and execution. Other research interests include ERG/VEP, ultrasound and tear film analysis.
Clinical findings and normative ocular data for free-living Anna's (Calypte anna) and Black-chinned (Archilochus alexandri) Hummingbirds.
Vet Ophthalmol. 2018 Feb 20;:
Authors: Moore BA, Maggs DJ, Kim S, Motta MJ, Bandivadekar R, Tell LA, Murphy CJ
OBJECTIVE: To estimate the prevalence of ocular disease and obtain normative ocular data for free-living hummingbirds.
ANIMALS STUDIED: Two hundred and sixty-three free-living, adult Hummingbirds from coastal and inland central California were studied, including Anna's (Calypte anna, n = 186) and Black-chinned (Archilochus alexandri; n = 77) hummingbirds.
PROCEDURES: Slit lamp biomicroscopy and indirect ophthalmoscopy were performed on all individuals. Rebound tonometry, measurement of horizontal palpebral fissure length, and streak retinoscopy were performed on select individuals. Five conscious Anna's Hummingbirds underwent ocular imaging including fundus photography, digital slit lamp photography, and anterior segment and retinal optical coherence tomography.
RESULTS: The prevalence of ocular disease in this population was 2.28%. Ocular imaging revealed a thin cornea, shallow anterior chamber, large lens, and a single central, deep convexiclivate fovea. Mean ± SD intraocular pressure was 11.21 ± 2.23 mm Hg. Mean ± SD eyelid length was 2.59 ± 0.19 mm. All eyes were emmetropic or mildly hyperopic with a mean (range) ± SD refractive error of +0.32 (-0.25 to +1) ± 0.33 diopters.
CONCLUSIONS: Consistent with previous reports, these data suggest that hummingbirds have visual characteristics found in predatory and prey species, as well as a low prevalence of spontaneous ocular disease. This work provides a set of reference values and clinical findings that can be used in the future research on hummingbird vision and ocular disease. It also provides representative diagnostic images of normal birds and demonstrates that advanced ocular imaging can be performed on manually restrained hummingbirds without pharmacologic dilation.
PMID: 29461005 [PubMed - as supplied by publisher]
Snake spectacle vessel permeability to sodium fluorescein.
Vet Ophthalmol. 2017 Jun 20;:
Authors: Bellhorn RW, Strom AR, Motta MJ, Doval J, Hawkins MG, Paul-Murphy J
OBJECTIVE: Assess vascular permeability of the snake spectacle to sodium fluorescein during resting and shedding phases of the ecdysis cycle.
ANIMAL STUDIED: Ball python (Python regius).
PROCEDURES: The snake was anesthetized, and spectral domain optic coherence tomography was performed prior to angiographic procedures. An electronically controlled digital single-lens reflex camera with a dual-head flash equipped with filters suitable for fluorescein angiography was used to make images. Sodium fluorescein (10%) solution was administered by intracardiac injection. Angiographic images were made as fluorescein traversed the vasculature of the iris and spectacle. Individually acquired photographic frames were assessed and sequenced into pseudovideo image streams for further evaluation CONCLUSIONS: Fluorescein angiograms of the snake spectacle were readily obtained. Vascular permeability varied with the phase of ecdysis. Copious leakage of fluorescein occurred during the shedding phase. This angiographic method may provide diverse opportunities to investigate vascular aspects of snake spectacle ecdysis, dysecdysis, and the integument in general.
PMID: 28635138 [PubMed - as supplied by publisher]
Effect of optical defocus on performance of dogs involved in field trial competition.
Am J Vet Res. 2012 Apr;73(4):546-50
Authors: Ofri R, Hollingsworth SR, Groth A, Motta MJ, Doval JH, Kass PH, Murphy CJ
OBJECTIVE: To measure the effect of induced myopia on field trial performance in dogs.
ANIMALS: 7 Labrador Retrievers and 1 Chesapeake Bay Retriever trained in field trial competition.
PROCEDURES: Dogs were commanded to retrieve targets at 137.2 m (150 yards). Each dog participated in 3 trials while their eyes were fitted with 0- (plano), +1.50-, or +3.00-diopter (D) contact lenses, applied in random order. Retrieval times were measured objectively, and dog performances were evaluated subjectively by masked judges.
RESULTS: Retrieval times were significantly faster with plano lenses than with +1.50- or +3.00-D lenses, but there were no significant differences in times between +1.50- and +3.00-D lenses. Masked judges assigned the best performance scores to dogs with plano lenses and the lowest scores to dogs fitted with +3.00-D lenses.
CONCLUSIONS AND CLINICAL RELEVANCE: Even mild myopic defocusing had a significant negative impact on both the subjective and objective assessments of dogs' performances. Dogs with demanding visual tasks or signs of visual deterioration should be evaluated retinoscopically to determine the refractive state because they may have ametropia.
PMID: 22452502 [PubMed - indexed for MEDLINE]
Genetic analysis of Anisakis typica (Nematoda: Anisakidae) from cetaceans of the northeast coast of Brazil: new data on its definitive hosts.
Vet Parasitol. 2011 Jun 10;178(3-4):293-9
Authors: Iñiguez AM, Carvalho VL, Motta MR, Pinheiro DC, Vicente AC
Anisakids from 5 different species of cetacean, Kogia breviceps, Peponocephala electra, Stenella clymene, Stenella longirostris and Steno bredanensis, were submitted to genetic analysis. Adults and larvae fixed in ethanol-formalin-acetic acid or in 70% ethanol for periods ranging from 10 months to 10 years were isolated from 9 cetaceans stranded on Ceará coast, Northeast Brazil. The 18S rDNA gene, ITS1, and specific Anisakis typica ITS regions were amplified by PCR. 18S rDNA and ITS1 region confirmed Anisakis sp. morphological identification but also detected the presence of Aspergillus sp. in longer preserved samples. All samples were identified as A. typica by ITS species-specific PCR. The study report three new definitive hosts of A. typica from the Brazilian Atlantic coast by genetic analysis: P. electra, K. breviceps, and S. clymene.
PMID: 21324600 [PubMed - indexed for MEDLINE]