Some drugs, like valproate, are helpful in reducing photosensitivity and preventing these seizures. Many questions arise for me when studying photosensitive epilepsy. It seems like the affects can be quite dispersed since the outcome can affect so many functions of the body. The person's muscles are affected. They cannot stand and often twitch.
Memory is affected.
The person cannot remember having the fit. The description of absences seems to suggest that alertness or wakefulness seem to be affected. Higher or lower frequencies don't have the same effect. Understanding the frequency effect has vast implications for understanding brain function. The rate of stimuli that a neuron or group of neuron can take in and why could tell a lot about the function of neurons in general.