Diagnostic Testing Center

The Diagnostic Testing Center of Wills Eye Hospital assists physicians in the diagnosis and treatment of ocular disease. Specialized fields of ophthalmic testing include cataract, cornea, glaucoma, neuro-ophthalmology, pediatrics, and retina.

Our technicians are highly trained; many are certified as COA’s, COT’s, CRA’s, and OCT’C’s. We are also certified in numerous clinical studies helping to grant FDA approval for the latest ocular medications.  Our center works as a testing site with the largest manufacturers of ocular diagnostic equipment and software.  Since we see such a large volume of patients with a vast array of diagnoses, our feedback is invaluable for the future of ocular care. We receive referrals to our center not only locally in the Pennsylvania Tri-State region but also nationally and around the globe.

We perform the following test procedures:

Visual Fields

  • Humphrey Visual Field
  • Ptosis Visual Field
  • Goldmann Visual Field
  • Microperimetry

Optical Coherence Tomography

  • Heidelberg Spectralis
  • Zeiss Cirrus
  • Zeiss Stratus 
  • Zeiss Visante (anterior segment OCT)
  • Topcon 3D OCT
  • Bioptogen hand held OCT
  • HRT


  • Fundus and optic nerve photography (mydriatic and non-mydriatic)
  • Slit lamp photography
  • Gonio photography using Retcam
  • External photography
  • Fundus autofluorescence


  • IOL Master
  • A scan biometry with or without IOL calculations
  • B scan ultrasonography
  • Ultrasound biomicroscopy (UBM)


  • Electoretinogram (ERG)
  • Multifocal ERG 
  • Pattern ERG
  • Visually evoked potential (VEP)
  • Multifocal VEP


  • Dark adaptation
  • Color vision (100 hue and D-15)
  • Pentacam corneal topography and pachymetry

Find out more about our test procedures.

Clinic Hours: Monday through Friday, 8:00 a.m. - 4:00 p.m.

Wills Eye Diagnostic Testing Center
840 Walnut Street, Suite 1150
Philadelphia, PA 19107

Phone: (215) 928-3406
Fax: (215) 928-3112

Director: Elizabeth L. Affel, MS, MT, OCT-C
Chief Technician: Judy Conboy, COT
Ophthalmic Photographer: Julia Monsonego, CRA