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Should 30 letters be added to the 4 m visual acuity score on the Early Treatment Diabetic Retinopathy Study Chart?

Chen FK, Ah-See KL, Wong EN, Tang I.
Should 30 letters be added to the 4 m visual acuity score on the Early Treatment Diabetic Retinopathy Study Chart?
Clin Exp Ophthalmol. 2016 May;44(4):355-6. doi: 10.1111/ceo.12714. No abstract available.
PMID: 26856543

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