====== Value of Two Stacked Prisms ======
**The prisms are pointing in the same direction **
===== Calculator =====
Stacked Prism Value Lookup
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==== Table ====
| | **1st Prism** |||||
| **2nd Prism** | **10Δ** | **20Δ** | **30Δ** | **40Δ** | **50Δ** |
| **10Δ** | 21 | 33 | 46 | 60 | 77 |
| **20Δ** | 33 | 47 | 66 | 89 | 122 |
| **30Δ** | 46 | 66 | 94 | 141 | 264 |
| **40Δ** | 60 | 89 | 141 | 339 | |
| **50Δ** | 77 | 122 | 256 | | |
Adapted From: {{::ophthalmic_prisms_measurement_errors_guyton_1983.pdf | Thompson & Guyton. Ophthalmic Prisms: Measurement Errors and How to Minimize Them. Ophthalmology 1983;90:204-2010}}
{{tag>strabismus prism calculator}}