Abstract: A sight-testing ambulance bus for performing ophthalmologic examinations and providing appropriate spectacles expediently in rural areas, in which the instruments being sensitive against mechanical vibration of the chassis of the bus excited by movement in the bus are supported independently from the bus by support rods extended through holes in the bus-floor and standing on the ground under the bus. The support rods are fixed on the bus floor when the bus is moving and shock-absorbers protecting the instruments from vibrations when the bus is driven.