This is a hand-operated machine that detects farsighted and nearsighted error in same mechanism, it gives the perfect result so don"t need to do the manual check up again after using this machine, it takes place of 2"fts x2"fts and runs on 240wats power battery, it is an eco friendly and user-friendly machine. This douse not have any complicated mechanism so if runs for long time with a low maintenance. All international languages options are available with this machine. In addition this machine can be made in very low price comparatively then other available machines in market.
