Focusing the image would also cause the sun's image to be focused on a few receptors, with the possibility of damage under the intense light; shielding the receptors would block out some light and thus reduce their sensitivity.
Pemfokusan gambar juga akan menyebabkan citra matahari akan difokuskan pada beberapa reseptor, dengan kemungkinan kerusakan di bawah paparan cahaya yang kuat; melindungi reseptor akan menghalangi cahaya dan dengan demikian mengurangi sensitivitas.