Fig. 3
Changes of the thickness of the photoreceptor layer and its ratio according to the measurement of the outer segment (OS) of the photoreceptor layer (PRL) in the eyes of 5 d old zebrafish (Danio rerio) embryos after exposure to benzophenone-2 (BP-2). Paraffin-section with the visible optical nerve of 4 µm thickness and HE-stained. A Eye of an embryo of the negative control. B Eye of an embryo exposed to 7 mg/L of BP-2. An increase in the overall size of the PRL after treatment with BP-2 was obvious. Likewise, a change in the ratio of the outer and the inner segment (OS, IS) of the PRL is evident due to the increase in the thickness of the OS