NOT A DOCTOR or other expert. Opinion only
Assuming you get clearance from your doctor to SCUBA dive using a vented earplug to equalize the pressrue between the plug and eardrum here is a quote from the DAN website
http://www.diversalertnetwork.org/medical/articles/article.asp?articleid=33
[QUOTE...]As for the use of earplugs, opinions differ on their use in scuba diving. In general, they are not recommended. However, some divers use earplugs in special situations. Divers should also know special considerations before trying them. We asked several referral doctors for DAN to address this issue; we also discussed it with a doctor who created vented earplugs that some divers endorse.
Dr. Allen Dekelboum, an ENT and DAN consulting physician in California, reiterated the common view that earplugs create an air pocket in the ear canal, preventing equalization and resulting in differences in the pressure between the water and a diver's ear canal. This situation could lead to serious injury, he said.
"With an intact tympanic membrane, the increasing water pressure against the earplug and the decreasing volume of air between the plug and the tympanic membrane would have a tendency to drive the plug against the TM," Dekelboum said. "The increasing water pressure also could wedge the plug in the ear canal. If this occurs, there is risk of external ear barotrauma."
To address these concerns, some manufacturers promote the vented earplug, which has a small hole for venting between the water and the ear canal. The holes typically have a valve for pressurization without letting water enter the ear canal.
Dr. Robert Scott, creator of Doc's Proplugs, said his vented earplugs are safe for divers to use. It has one chief advantage, he said: "They make pressurization easier."
Most manufacturers of vented plugs emphasize the ease at which their products equalize. Doc's Proplugs website (
http://www.proplugs.com) recommends that divers, to maintain proper pressurization, clear their ears frequently while wearing the earplugs. According to the website, those having trouble clearing with the plugs should check if earwax is pushing against the plug vent or blocking the canal. The website also says that if the vent is fouled by debris while a diver descends, it is best to remove the Proplug, and if it is fouled during ascent, there is no problem: the air and water under pressure can escape around the Proplug. ...
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Alternate product is mask wiht a ear cover that runs a tube from the mask to the ear to equalize and keep the ear dry.
http://www.amazon.com/Protection-Snorkel-Snorkeling-Protects-infection/dp/B0021P72UI That would be the a possibility but again if it leaks you are in trouble.