<span>hello there hester , i would say needed to form cell membranes</span>
A contact lens is a lens placed on the cornea of the eye.
Importance of buffers in contact lens products:
Buffers: They aim to keep the pH of the solutions at values between 6.6 and 7.8 in order to maintain the lens parameters and the effectiveness of the solutions. They are made by the combination of an acid and its sodium salt (phosphate and acetate for example). Borate and citrate buffers are used.
Importance of isotonicity in contact lens products:
The solution composed by isotonic saline solution.
Isotonia is expressed by osmolarity or cryoscopic lowering
- 0.236 to 0.446 mOsmoles / l (increases during the day)
- If the osmolarity of the mixture is different from that of the tears, it causes discomfort and irritation
• Increased tear secretion
• Increase the blink frequency
- If hypotonia, entry of water to the epithelial cells, if hypertonia: inverse
- Osmolarity restored 1 or 2 minutes after instillation
During any outbreak or whenever problems occur, there are
always three major steps to take.
1. First, is the containment action. In this step, actions
are taken to reduce or lessen the severity of the people affected. This aims in
isolating the disease. In this step, scientific knowledge is used in making
decision on what containment actions to take.
2. Second is the corrective action. This step focuses
solely on formulating medicine to treat the disease. Once again scientific
knowledge is used in creating those medicines.
3. Third is the preventive action. To prevent this disease
outbreak from recurring, certain actions are made to ensure this does not
happen again.
Multi cellular organisms like animals are eukaryotes
