New Bolton Center Kennett Square, PA
Emergencies & Appointments:
Ryan Hospital Philadelphia, PA


American College of Veterinary Ophthalmologists

Professor of Clinical Ophthalmology, University of Pennsylvania School of Veterinary Medicine

Clinical Specialties: Medicine, Ophthalmology
Research Areas: Corneal wound healing, corneal surgery
PubMed Link
Contact Information:
Penn Vet Ryan Veterinary Hospital
3900 Delancey Street

corneal wound healing, corneal surgery

Lassaline, ME Equine ocular squamous cell carcinoma: Genetic associations Equine Veterinary Education : , 2020.

Knickelbein, K. E., Lassaline, M. E., Singer-Berk, M., Reilly, C. M., Clode, A. B., Famula, T. R., Michau, T. M., Bellone, R. R. A missense mutation in damage-specific DNA binding protein 2 is a genetic risk factor for ocular squamous cell carcinoma in Belgian horses Equine Veterinary Journal 52: 34-40, 2020.

Saldinger, L. K., Nelson, S. G., Bellone, R. R., Lassaline, M., Mack, M., Walker, N. J., Borjesson, D. L. Horses with equine recurrent uveitis have an activated CD4+ T-cell phenotype that can be modulated by mesenchymal stem cells in vitro Veterinary Ophthalmology 23: 160-170, 2020.

Rockwell, H., Mack, M., Famula, T., Sandmeyer, L., Bauer, B., Dwyer, A., Lassaline, M., Beeson, S., Archer, S., McCue, M., Bellone, R. R. Genetic investigation of equine recurrent uveitis in Appaloosa horses Animal Genetics 51: 111-116, 2020.

Knickelbein, K. E., Holmberg, B. J., Lassaline, M. E. Equine retrobulbar disease: Diagnoses and outcomes of 15 horses with exophthalmos (1988–2017) Equine Veterinary Education 31: 601-608, 2019.

Knickelbein, K. E., Luethy, D., Thomasy, S. M., Reilly, C., Strom, A. R., Lassaline, M. E. Equine eosinophilic keratoconjunctivitis in California: retrospective study of 47 eyes from 29 cases (1993-2017) Veterinary Ophthalmology 22: 510-519, 2019.

Edwards, S. G., Maggs, D. J., Byrne, B. A., Kass, P. H., Lassaline, M. E. Effect of topical application of 0.5% proparacaine on corneal culture results from 33 dogs, 12 cats, and 19 horses with spontaneously arising ulcerative keratitis Veterinary Ophthalmology 22: 415-422, 2019.

Singer-Berk, M. H., Knickelbein, K. E., Lounsberry, Z. T., Crausaz, M., Vig, S., Joshi, N., Britton, M., Settles, M. L., Reilly, C. M., Bentley, E., Nunnery, C., Dwyer, A., Lassaline, M. E., Bellone, R. R. Additional Evidence for DDB2 T338M as a Genetic Risk Factor for Ocular Squamous Cell Carcinoma in Horses International Journal of Genomics 2019: , 2019.

Knickelbein, K. E., Stock, M., Carrasco, S. E., Reilly, C. M., Lassaline, M. E. Traumatic phacocele in an American Miniature Horse Veterinary Ophthalmology 22: 61-66, 2019.

Knickelbein, K. E., Lassaline, M. E., Bellone, R. R. Limbal squamous cell carcinoma in a Rocky Mountain Horse: Case report and investigation of genetic contribution Veterinary Ophthalmology 22: 201-205, 2019.

PhD University of Michigan, Ann Arbor, MI, 1994

DVM (Veterinary Medicine) Michigan State University, East Lansing, MI, 2000

American College of Veterinary Ophthalmologists

College of Veterinary Medicine University of Florida Gainesville FL (2001 to 2004)
Resident in Comparative Ophthalmology

Rood and Riddle Equine Hospital Lexington, KY (2000 to 2001)
Medicine & Surgery Intern

University of Illinois, Champaign, IL (1994 to 1996)
NIH Postdoctoral Fellowship, Psychology