Graham Dwyer's murder trial has heard low water levels led to the discovery of keys and glasses belonging to Elaine O'Hara in the Vartry reservoir a year after her disappearance.

The 42 year old architect from Kerrymount Close, Foxrock denies murdering the childcare worker at Killakee on August 22nd, 2012.

The court heard anglers recovered a rope, a vest, bondage handcuffs, a rubber gag and a blindfold in the Vartry reservoir in Roundwood on September 10th 2013.

Follow up searches involving metal detectors and the garda sub-aqua unit uncovered many more items including keys, glasses, a bondage mask, butt plugs, a nokia phone and two sim cards.

Loyalty cards linked the set of keys to the missing Elaine O'Hara whose body was discovered around this time at Killakee in the Dublin Mountains.

There was some humour as a retail director from Specsaver struggled – even with glasses on - to read an eight digit code on the side of a pair of frames found in the water.

However he was satisfied that the unique code linked the frames to Elaine O'Hara's prescription.

Earlier, an angler has told the court that he fished out bondage cuffs, a black blindfold and a rubber ball gag from the lake at Roundwood in September 2013.

William Fegan has said the water levels in the reservoir were particularly low, around 12-18 inches, following the hot summer.

He said the group he was with left the items on a wall but he returned to the bridge at Roundwood the following morning because he'd a niggling feeling something wasn't right.

He told the Central Criminal he put the items in a bag and contacted gardai.

Graham Dwyer of Kerrymount Close, Foxrock denies murdering childcare worker Elaine O'Hara, who was allegedly killed in a sexually motivated attack in the Dublin mountains in August 2012.