diff --git a/src/napari_spatialdata/_viewer.py b/src/napari_spatialdata/_viewer.py
index a714975..6bb0dda 100644
--- a/src/napari_spatialdata/_viewer.py
+++ b/src/napari_spatialdata/_viewer.py
@@ -13,7 +13,8 @@
 from qtpy.QtCore import QObject, Signal
 from shapely import Polygon
 from spatialdata.models import PointsModel, ShapesModel
-from spatialdata.transformations import Identity
+from spatialdata.transformations import Affine, Identity
+from spatialdata.transformations._utils import scale_radii
 
 from napari_spatialdata.utils._utils import (
     _adjust_channels_order,
@@ -307,7 +308,7 @@ def add_sdata_circles(self, sdata: SpatialData, key: str, selected_cs: str, mult
         radii = df.radius.to_numpy()
         adata = _get_metadata_adata(sdata, original_name)
 
-        self.viewer.add_points(
+        layer = self.viewer.add_points(
             xy,
             name=key,
             affine=affine,
@@ -324,6 +325,8 @@ def add_sdata_circles(self, sdata: SpatialData, key: str, selected_cs: str, mult
                 "indices": df.index.to_list(),
             },
         )
+        assert affine is not None
+        self._adjust_radii_of_points_layer(layer=layer, affine=affine)
 
     def add_sdata_shapes(self, sdata: SpatialData, key: str, selected_cs: str, multi: bool) -> None:
         original_name = key
@@ -405,7 +408,7 @@ def add_sdata_points(self, sdata: SpatialData, key: str, selected_cs: str, multi
 
         xy = points[["y", "x"]].values[subsample]
         np.fliplr(xy)
-        self.viewer.add_points(
+        layer = self.viewer.add_points(
             xy,
             name=key,
             size=20,
@@ -421,6 +424,23 @@ def add_sdata_points(self, sdata: SpatialData, key: str, selected_cs: str, multi
                 "indices": subsample.tolist(),
             },
         )
+        assert affine is not None
+        self._adjust_radii_of_points_layer(layer=layer, affine=affine)
+
+    def _adjust_radii_of_points_layer(self, layer: Layer, affine: npt.ArrayLike) -> None:
+        assert isinstance(affine, np.ndarray)
+        axes: tuple[str, ...]
+        if affine.shape == (3, 3):
+            axes = ("y", "x")
+        elif affine.shape == (4, 4):
+            axes = ("z", "y", "x")
+        else:
+            raise ValueError(f"Invalid affine shape: {affine.shape}")
+        affine_transformation = Affine(affine, input_axes=axes, output_axes=axes)
+        metadata = layer.metadata
+        radii = metadata["sdata"][metadata["name"]].radius.to_numpy()
+        new_radii = scale_radii(radii=radii, affine=affine_transformation, axes=axes)
+        layer.size = new_radii * 2
 
     def _affine_transform_layers(self, coordinate_system: str) -> None:
         for layer in self.viewer.layers:
@@ -432,3 +452,5 @@ def _affine_transform_layers(self, coordinate_system: str) -> None:
                 affine = _get_transform(element_data, coordinate_system)
                 if affine is not None:
                     layer.affine = affine
+                    if layer._type_string == "points":
+                        self._adjust_radii_of_points_layer(layer, affine)