7) Ophthalmology
1. Chitosan possesses all the characteristics making an ideal contact lens:
① Optical clarity
② Mechanical stability
③ Sufficient optical correction
④ Gas permeability
⑤ Wet ability and immunological compatibility
2. Contact lenses are made from partially depolymerized and purified squid pen chitosan
3. The antimicrobial and wound healing properties of chitosan along with an excellent film capability make
chitosan suitable for development of ocular bandage lenses
8) Metal capture from wastewater
1. Chitosan is used for the removal of Hg+2, Cd2+ , Cu2+, Ni2+, and Zn2+ from solution
2. Hydroxymethyl chitin and other water-soluble derivatives are useful flocculents for anionic waste
streams
① Chitosan N-benzylsulfonate derivatives were used as sorbents for removal of metal ions
② The selective adsorption capacity for metal ions of amidoximated chitosan bead g-PAN copolymer
③ Chitosan has a natural selectivity for heavy metal ions and is useful for the treatment of wastewater
3. The adsorption capacity increased with a decrease in the size of the flakes, which implied that metal ions
were preferably adsorbed on the outer surface of chitosan in the removal of Cr(III) from the wastewater