Clark Chang
Optometrist · Philadelphia, PANPI 1528267507
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $25,525 of the $36,883 with a category attached, or 69.2%. 22 manufacturers reported payments, led by AbbVie at 45.9% of the total. Reporting peaked in 2022 at $20,372 and has fallen 97.4% since, to $535 in 2025. Among optometrist clinicians in PA with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 104 payments — averaging $354.65 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AbbVie$17K
- Oculus, Inc.$7K
- Dompe US, Inc.$5K
- Sun Pharmaceutical Industries Inc.$5K
- ABB Con-cise Optical Group LLC$750
- Glaukos Corporation$668
- plus $2K from 16 others
What the payments were for
- Consulting fees$3,4509%
- Speaking & faculty fees$25,52569%
- Travel & lodging$3,72810%
- Food & beverage$4,16611%
- Education$140%
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| AbbVie(2 entities) | 38 | $16,945 |
| Oculus, Inc. | 9 | $6,581 |
| Dompe US, Inc. | 7 | $5,023 |
| Sun Pharmaceutical Industries Inc. | 8 | $4,531 |
| ABB Con-cise Optical Group LLC | 1 | $750 |
| Glaukos Corporation | 9 | $668 |
| Bausch & Lomb Americas Inc. | 5 | $475 |
| Alcon | 6 | $431 |
| Oyster Point Pharma, Inc. | 4 | $274 |
| Coopervision Inc. | 2 | $199 |
| Mallinckrodt Enterprises LLC | 1 | $138 |
| Tarsus Pharmaceuticals, Inc. | 1 | $136 |
| Harrow Eye, LLC | 3 | $133 |
| Novartis | 2 | $115 |
| Biotissue Holdings Inc. | 1 | $107 |
| Carl Zeiss Meditec, Inc. | 1 | $105 |
| Immunogen, Inc. | 1 | $79 |
| Shire North American Group Inc | 1 | $70 |
| Johnson & Johnson Vision Care, Inc. | 1 | $50 |
| Avedro Inc. | 1 | $47 |
| Mallinckrodt Hospital Products Inc. | 1 | $14 |
| Bausch & Lomb, A Division Of Bausch Health US, LLC | 1 | $14 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
- VUITY$15,307
- Pentacam$6,500
- Oxervate$4,993
- CEQUA$4,275
- Contact Lens$750
- KXL System$353
- MIEBO$284
- XIIDRA$284
- TYRVAYA$228
- VYZULTA$149
- enVista MX60 IOL$149
- STELLARIS ELITE$149
- Clareon PanOptix Pro$148
- ACTHAR$138
- XDEMVY$136
- Photrexa$133
- Prokera$107
- CIRRUS HD-OCT$105
How this compares
$36,883 in reported general payments places this provider in the 95th percentile of 2,165 optometrist providers in Pennsylvania.
Other optometrist in Philadelphia
- Gretchen BrewerPhiladelphia$79K
- Alan KabatPhiladelphia$49K
- Melissa TregoPhiladelphia$46K
- Elizabeth TonkeryPhiladelphia$40K
- Tu DinhPhiladelphia$28K
- Justin ShermanPhiladelphia$17K
- Diana ChuongPhiladelphia$10K
- David DuffyPhiladelphia$10K
- Andrew MeagherPhiladelphia$9K
- Kennard HerringPhiladelphia$9K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.