Lens

General features

Type

Advantage

Disadvantage

Koeppe

Available in small, medium and large size.

Direct

Convenient for examination under anesthesia (EUA), no angle distortion, allows the view of the fundus, easiest for angle photography, excellent panoramic view.

Patient must be in supine position, laborious examination patient dislikes, examiner must change position, operating microscope required.

Barkan

Available for adults and for children

Direct

Surgical goniolens with blunted side allows access for goniotomy, variable sizes.

Same as Koeppe.

Table 1: Direct Lenses.