The purpose of this study is to identify the severity level distribution at the moment of diagnosis, in diabetic patients with macular edema from a Mexico City sample, and to identify the rate with severe macular edema that needed immediate treatment.

The international severity scale grades macular edema as mild, moderate or severe, according to the distance of the thickening from the center of the fovea; However, this scale does not define the distances which fulfill the criteria of "distant from" or "approaching" the center of the macula; a quantitative and reproducible tool, such as optical coherence tomography (OCT), could be more accurate to grade severity, by localizing thickening in a standardized way.

As far as we know, distribution of clinically significant macular edema at the moment of diagnosis, according to the international scale has not been described. A study was conducted to identify the rate of eyes that had severe macular edema at the moment of diagnosis, whose risk of visual loss could be higher and required immediate treatment.

Inclusion Criteria:

• type 2 diabetic
• regardless of diabetes duration and retinopathy severity level
• one or both eyes with CSME

Exclusion Criteria:

• media opacities that prevented an adequate fast macular map from being acquired
• a thickened posterior vitreous
• any additional retinal disease

Target population were type 2 diabetic patients with CSME who attended general hospitals of Mexico City and its metropolitan area; available population were patients with CSME evaluated at a general hospital