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Investigated eyedropper bottles.
| Category | Number | Number of filter membrane |
|---|---|---|
| Ocular hypotensive | 35 | 6 |
| Dry eye | 11 | 1 |
| Antibiotics | 9 | 0 |
| Steroid | 8 | 0 |
| Antiallergy | 8 | 1 |
| Nonsteroid anti-inflammatory | 4 | 0 |
| Asthenopia | 2 | 0 |
| Mydriatics | 5 | 0 |
| Topical anesthesia | 2 | 0 |
| Cataract | 1 | 0 |
| Immunosuppressant | 1 | 0 |
| Total | 86 | 8 |
