What progression in symptoms would classify as worsening vision for a CNV patient?

Visual distortions are considered a significant progression in symptoms for a patient with choroidal neovascularization (CNV) that indicates worsening vision. In the context of CNV, patients may experience metamorphopsia, which is a distortion of visual images, often described as wavy or bent lines. This symptom arises from the disruption of the retinal pigment epithelium and subsequent changes in the macular structure due to fluid accumulation associated with CNV.

While loss of peripheral vision can represent a change in vision, it is less specific to the typical progression associated with CNV. Similarly, stable vision or improved visual acuity would not classify as worsening; rather, they suggest that the condition is remaining the same or improving, which is not characteristic of disease progression. Therefore, the presence of visual distortions is a clear and concerning symptom that indicates the macula's involvement and potential further decline in overall visual function in CNV patients.