Can a Human See a Single Photon?

Original by Philip Gibbs 5-November-1996

The human eye is very sensitive but can we see a single photon? The answer is that the sensors in the retina can respond to a single photon. However, neural filters only allow a signal to pass to the brain to trigger a conscious response when at least about five to nine arrive within less than 100 ms. If we could consciously see single photons we would experience too much visual "noise" in very low light, so this filter is a necessary adaptation, not a weakness.

Some people have said that single photons can be seen and quote the fact that faint flashes from radioactive materials (for example) can be seen. This is an incorrect argument. Such flashes produce a large number of photons. It is also not possible to determine sensitivity from the ability of amateur astronomers to see faint stars with the naked eye. They are limited by background light before the true limits are reached. To test visual sensitivity a more careful experiment must be performed.

The human retina at the back of the eye has two types of receptors known as cones and rods. The cones are responsible for colour vision but are much less sensitive to low light than the rods. In bright light the cones are active and the iris is stopped down. This is called photopic vision. When we enter a dark room the eyes first adapt by opening up the iris to allow more light in. Over a period of about 30 minutes there are other chemical adaptations which make the rods become sensitive to light at about a 10,000th of the level needed for the cones to work. After this time we see much better in the dark but we have very little colour vision. This is known as scotopic vision.

The active substance in the rods is Rhodopsin, A single photon can be absorbed by a single molecule which changes shape and chemically triggers a signal which is transmitted to the optic nerve. Vitamin A aldehyde also plays an essential role as a light absorbing pigment. A symptom of vitamin A deficiency is night blindness because of the failure of scotopic vision.

It is possible to test our visual sensitivity by using a very low level light source in a dark room. The experiment was first done successfully by Hecht, Schlaer and Pirenne in 1942. They concluded that the rods can respond to single quanta during scotopic vision.

In their experiment they allowed human subjects to have 30 minutes to get used to the dark. They positioned a controlled light source 20 degrees to the left of the point on which the subjects eyes were fixed so that the light would fall on the region of the retina with the highest concentration of rods. The light source was a disk which subtended an angle of 10 minutes of arc and emitted a faint flash of 1 millisecond to avoid too much spatial or temporal spreading of the light. The wavelength used was about 510 nm (green light). The subjects were asked to respond "yes" or "no" to say whether or not they thought they had seen a flash. The light was gradually reduced in intensity until the subjects could only guess the answer.

They found that about 90 quanta had to enter the eye for a 60% success rate in responding. Since only about 10% of photons which arrive at the eye actually reach the retina this means that about 9 photons were actually required at the receptors. Since the photons would have been spread over about 350 rods they were able to conclude statistically that the rods must be responding to single photons even if the subjects were not able to see them when they arrived too infrequently.

In 1979 Baylor, Lamb and Yau were able to use rods from toads placed into electrodes to show directly that they respond to single photons.

References

Julie Schnapf, "How Photoreceptors Respond to Light", Scientific American, April 1987

S. Hecht, S. Schlaer and M.H. Pirenne, "Energy, Quanta and vision." Journal of the Optical Society of America, 38, 196-208 (1942)

D.A. Baylor, T.D. Lamb, K.W. Yau, "Response of retinal rods to single photons." Journal of Physiology, Lond. 288, 613-634 (1979)

J Physiol. 1979 Mar;288:613-34.

Responses of retinal rods to single photons.

Baylor DA, Lamb TD, Yau KW.

1. A suction electrode was used to record the membrane current of single rod outer segments in pieces of toad retina. During dim illumination the membrane current showed pronounced fluctuations.

2. Amplitude histograms of responses to dim flashes of fixed intensity exhibited two discrete peaks, one at 0 pA and one near 1 pA, suggesting that the response was quantized. By setting a criterion amplitude level, flash responses could be classed as 'failures' (no response) or as 'successes' (at least one quantal event).

3. The variation of fraction of successes with flash intensity was consistent with the hypothesis that each quantal electrical event resulted from a single photoisomerization.

4. The quantal event had a mean amplitude of about 1 pA (5% of the standing dark current) and a standard deviation of 0.2 pA. Dispersion in the event amplitude prevented identification of histogram peaks corresponding to two or more photoisomerizations.

5. Individual quantal responses exhibited a smooth shape very similar to that of the average quantal response. This suggests that a single photoisomerization releases many particles of transmitter and that radial diffusion of internal transmitter is not a major source of delay in the light response.

6. The 'quantum efficiency' with which an absorbed photon generated an electrical event was measured as 0.5 +/- 0.1 (S.E. of mean, n = 4). This is slightly lower than the quantum efficiency of photoisomerization obtained previously for rhodopsin in solution.

7. At wavelengths between 420 and 700 nm the quantal event was invariant in size, although the cell's sensitivity varied over a range of 10(5).

8. The power spectrum of the fluctuations in dim steady light was predicted by assuming that a random series of quantal events occurred independently.

9. In brighter light the fluctuations were faster, and the response to an incremental flash was reduced in size and duration. The power spectrum could be predicted by assuming random superposition of events with the shape of the incremental flash response.

Who will be the first to show up at a star party with a toad sticking out of the eyepiece?

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