Toric lenses and soft CL problems. Toric Lens Lenses used to correct astigmatic/sphericocylin drical patients. Toric lenses have a ballast or “weight”
Elements of Railway Tracks
ELEMENTS OF RAILWAY TRACKS. A railway track is a combination of 1. Formation 2. Ballast 3. Sleepers 4. Rails 5. Fastenings.
