Search

In a prospective, double-blind study, 19 patients with a classical subfoveal choroidal neovascularisation due to AMD were followed-up over a period of 2 years. Every 3 months a standardised visual acuity test, a contrast sensitivity test and fluorescein-angiography were performed. Overall, visual acuity dropped from 20/125 initially down to 20/250 after 2 years. Contrast sensitivity decreased from 23 down to 19 recognised letters. The functionally superior group 1 (n = 7) with a visual acuity of 20/65 at baseline, improved up to 20/50 after 2 years, while group 2 (n = 12) with a baseline visual acuity of 20/125 showed a decrease down to 20/400 after 24 months. Contrast sensitivity stabilised or improved in 10 patients from 22 to 25 letters, while in 9 patients the score dropped from 23 down to 8 recognised letters. The results underline the unfavourable functional prognosis of classical subfoveal lesions in AMD. However, stabilisation is possible depending on baseline visual acuity which is critical whenever results of nonplacebo-controlled studies have to be assessed. Moreover these results suggest that the urgency of a therapeutical intervention might be overestimated. As treatment, a fairly gentle, primarily atraumatic, CNV-selective strategy should be chosen, so that the self-limiting potential of this disease can be utilised in addition to the therapeutic effect.

Purpose: Photodynamic therapy (PDT) has been shown to provide immediate occlusion of choroidal neovascularization (CNV), followed by recurrent leakage after single PDT in the majority of the cases after 3 months. Indocyanine green angiography (ICG-A) was used to evaluate completeness of CNV occlusion, effects on physiological choroid and patterns of CNV recurrence. Methods: ICG-A was performed using a confocal laser scanning ophthalmoscope (HRA) before PDT at 1 week, 4 and 12 weeks following PDT. Twenty patients with single and 10 patients with repeated PDT treatments with administration of benzoporphyrin derivative and radiant exposures between 50 and 150 J/cm2 were evaluated. Results: Before PDT well-defined CNV was detectable during early ICG-A in all lesions. Depending on the number of treatments, CNV was absent in early phase ICG-A in 46–83 %. CNV reappeared at week 4 in many and at 12 weeks in 77 (66 %) of the cases. The treated area regularly showed hypofluorescence, which persisted until week 12. The intensity of choroidal hypofluorescence showed wide interindividual variability. Recurrence may originate from persistent feeder vessels. Conclusion: With ICG-A we demonstrated that PDT induces hypofluorescence of CNV and choroid possibly due to perfusion changes or blockade phenomena. Recurrence may be due to reperfusion of the preexisting CNV or regrowth from feeder vessels.

Purpose: Branch retinal vein occlusion (BRVO) induces variable functional deficits depending on the grade of vascular occlusion and its localisation. Theses deficiences are not easily defined by visual acuity measurements. However, microperimetry offers topical mapping of retinal function, allowing precise documentation of the intensity and dimension of retinal functional loss in BRVO.