Experience using the heidelberg retina angiograph 2 with a wide-field contact lens system in diabetic retinopathy cases.

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HRA (Heiderberg Retina Angiograph ) 2 uses a confocal scanning laser system which can provide high quality digital images but its imaging field is only 30 °at most . HRA 2 with a wide -field contact lens system allows an imaging field of up to 150 °.We examined the advantages and disadvantages of HRA 2 , with a wide -field contact lens , for the evaluating diabetic retinopathy (DR ).HRA 2 was beneficial for obtaining images of the entire retina simultaneously , without missing peripheral retinal non-perfusion and neovascularization . On the other hand , clear images connot be acquired in cases with media opacities such as corneal dystrophy , cataract and asteroid hyalosis , or in those with yellow tinted IOL .HRA 2 with a wide -field contact lens is useful for visualizing peripheral retinal lesions in DR cases .