         Senténee 1: An'experimental drug can‘stow  the-loss of vision caused by an eye disease  that: isthe” leading scause™ of - blindness  sariong the elderly, researchers have: found:         Senienice a experimental drug.can + slow.  the loss. of vision’ caused: by a maddening  eye: disease’ that is’ the feading cause of  blindness “among. the elderly”, : doctors  reported on Saturday’: .         