What are the layers of the retina in the correct order?
1) OPL, ONL, ELM, photoreceptor layer, RPE
2) ONL, OPL, photoreceptor layer, ELM, RPE
3) ELM, ONL, photoreceptor layer, OPL, RPE
4) photoreceptor layer, OPL, ONL, ELM, RPE