Photographing The Victims' Eyes

I present an extract from a work by Jo Chipperfield entitled, "Bullet-holes For Eyes": The Lingering Image of Horror in a 1920's Murder. He makes reference to a book written in 1939 about the Ripper murders. In this book, the author explains that photographs were taken of the eyes of three Ripper victims: Chapman, Stride and Kelly. Chief Inspector Walter Dew corroborated that several photographs of Mary Jane Kelly's eyes were taken.

"......But the idea persisted: in 1888, the same year Eastman released the first Kodak box camera to use his revolutionary celluloid film, between five and eleven women were murdered and mutilated by an elusive killer in the Whitechapel district of London. A 1939 book on the Ripper murders (which also puts forward the "Jill the Ripper" hypothesis), states that the eyes of three victims, Annie Chapman, Elizabeth Stride and Mary Kelly, were photographed, but that "no practical result was got from these experiments."
Attempts to photograph the eyes of the final victim, Mary Kelly, are corroborated by Walter Dew, one of the detectives on the case:

"I do not for a moment think that the police ever seriously expected the photograph of the murderer to materialise, but it was decided to try the experiment. Several photographs of the eyes were taken by expert photographers with the latest type of cameras.
The result was negative...the very fact that this forlorn hope was tried shows that the police, in their eagerness to catch the murderer, were ready to follow any clue and to adopt any suggestion, even at the risk of being made to look absurd."

As the century turned, the instances of retinal imagery become more confined to fiction (most notably in Jules Verne's Les Freres Kip (1902), where the Kip brothers are exonerated by the examination of a photograph of the murder victim's eyes; and Rudyard Kipling's At the End of the Passage (1912) in which a character dies of fright from seeing a terrifying vision which his friend, Dr. Spurstow, then photographs and is so disturbed that he smashes the camera and plates). In little more than 20 years, optograms had gone from being seriously proposed as a new scientific weapon in the fight against crime to a superstition fit only for horror fiction....."

Source: "Bullet-holes for eyes": The Lingering Image of Horror in a 1920's Murder," by Jo Chipperfield

Note: Does anyone know what happened to the photographs that were taken of Chapman's, Stride's and Kelly's eyes?