These unnervingly alien-looking reptile and amphibian eyes seem to be staring straight into your soul.
The mesmerising close-up shots show the remarkable ocular variety the creatures have developed through millions of years of evolution.
Professional wildlife photographer Daniel Heuclin travelled the world to capture the images of various tropical frogs and lizards peering straight into the lens.
He was struck by the differences he found - from the bright red iris of a Cuban tree frog to the exquisite mosaic pattern of a chameleon's eye.
'I was enchanted by the strange beauty of these interesting creature's striking eyes,' said the 65-year-old Frenchman.
'It took me a few minutes to take the photographs, but they will be extraordinarily different forever.
'My favourite image is of the chameleon's eye - the texture and palette of colours in such a small space is astonishing.'
Mr Heuclin, from Vaux en Couhe, France, snapped the tomato frog and chameleon in Madagascar.
The Tokay gecko was photographed on Panay island, in the Phillipines, and the Monarch gecko in Luzon, Phillipines.
The slender-legged tree frog was captured in French Guiana and the Cuban tree frog in Everglades Nal park.
The Cape verde gecko and the green tree frog were observed in captivity.
Mr Heuclin specialises in photographing reptiles, amphibians and rare species.