Change Checkbox Opacity in Style not working

I have a disabled CheckBox that I want to change the Opacity through a Style when IsChecked is True.

Issue: Opacity is not changing.

<Style TargetType="{x:Type CheckBox}">
                <Setter Property="IsChecked"
                        Value="False" />
                <Style.Triggers>
                    <Trigger Property="IsChecked"
                             Value="True">
                        <Setter Property="CheckBox.Opacity"
                                Value="1.0" />
                   </Trigger>
                </Style.Triggers>
</Style>


<CheckBox  IsChecked="{Binding IsChecked, Mode=OneWay}" IsEnabled="False"/>