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Hello and thanks for your question.
Your husband's symptoms sound consistent with a migraine headache. A typical migraine headache starts with these shimmering or flashing lights, often times they surround a blurry area or have dots or jaggedly lines associated with them. They tend to progressively increase in intensity and sometimes march across the visual field. Many times this is then accompanied by nausea, irritability, sensitivity to bright lights and/or loud noises. After the onset of the lights (called scintillating scotomas), the headache typically starts and the light show tends to progressively go away.
If you have any question or concern about the diagnosis, however, your GP is a good person to see to get the second opinion. Ultimately, neurologists end up treating migraines a lot, but most GPs can do this too.
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.