ophthalmology, Ryan Hospital, Penn VetThe Ophthalmology Service deals with the diagnosis and treatment of ocular diseases in animals. We offer a large spectrum of diagnostic and therapeutic options, including retinal testing by electroretinography (ERG) and cataract surgery by phacoemulsification.

The hospital also offers an eye clinic that specializes in inherited diseases of the eye in animals.

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Clinical Team
  Name Title
 Gustavo Aguirre, VMD, Penn Vet, ophthalmology Gustavo D. Aguirre, VMD, PhD, DAVCO Professor of Ophthalmology and Medical Genetics
Chief, Section of Ophthalmology
 William Beltran, Penn Vet, ophthalmology William Beltran, DVM, PhD, ECVO Associate Professor of Ophthalmology
 Stephen Gross, VMD, Penn Vet, ophthalmology Stephen Gross, VMD, ACVO Staff Ophthalmologist
 William Crumley, Penn Vet, ophthalmology William Crumley, MS, DVM, ACVO Ophthalmology Service Chief


Residents & Vet Tech Staff
  Name Title
Dr. Keiko Miyadera  Keiko Miyadera, DVM, PhD
Penn Vet, deLisle, ophthalmology  Margaret “Peg” deLisle, CVT
Veterinary Technician

Inherited Eye Diseases Clinic

  • Appointments and Information: 215.898.4680.
  • Special rates are available for litters or groups of dogs.


FOCUS: About Dr. Gus Aguirre

Penn Vet, ophthalmology, Dr. Gustavo AguirreDr. Aguirre’s veterinary ophthalmological and gene-therapy research focuses on inherited diseases of the eye, especially degeneration of the retina in dogs, humans, and other mammals. In 2001, he, his colleagues and researchers at Penn were the first to restore vision in blind dogs using gene therapy. 

Dr. Aguirre's research interests include molecular basis of inherited eye diseases, and developing DNA-based tests for their control. His clinical interest is inherited eye disease and he is the director of the "Inherited Eye Diseases Clinic". 

Currently, Dr. Aguirre is involved in research regarding inherited eye diseases among which are progressive retinal atrophy, or PRA, cataracts and the like. 

Since dogs and people share such similar genetic makeups, the research has the potential to identify the causes of some cases of X-linked blindness in humans. 

Dr. Gustavo D. Aguirre received his VMD from University of Pennsylvania in 1968, completed a residency in Ophthalmology from 1968 to 1969, received a fellowship in Retinal Cell Biology from 1969 to 1971 and earned a PhD at the University of Pennsylvania in 1975. After 12-years at Cornell University, he returned in 2004 to the Ryan Hospital.