Çıplak gözle görülebildi. - It could be seen by the naked eye.
Yıldızları çıplak gözle, hatta daha da iyisi teleskopla görebilirsin. - You can see the stars with your naked eye, and even better through a telescope.
English - English
Definition of the naked eye in English English dictionary
the eye unaided by any optical instrument that alters the power of vision or alters the apparent size or distance of objects; "it is not safe to look directly at the sun with the naked eye