This document discusses contact lens deposits. It defines deposits as any surface coating or matrix that does not rinse off during blinking. Deposits are categorized by position (external or internal) and nature (organic or inorganic). Organic deposits include proteins and lipids from tears. Inorganic deposits include calcium salts and pigments. Environmental deposits come from sources like tap water or cosmetics. The document outlines how deposits form and their effects like discomfort, blurred vision, and increased risk of infection. It also describes different methods for removing protein, lipid, and other types of deposits from contact lenses.

1. CONTACT LENS
DEPOSITS
Group D PRESENTATION

2. Group D members
◦ Mohamed Saed Ali
◦ Mubarak Mawlid Yousuf
◦ Aidarous Ahmed Hersi
◦ Ridwan Awil Jama
◦ Maimoun Abib Hassan
◦ Naseem Hussein Hassan
◦ Najma Ibrahim Osman

3. topics
◦ What is contact lens deposition
◦ Types of contact lens deposition according to:
◦ position
◦ nature
◦ Effects of contact lens deposition
◦ Removers of contact lens deposition
◦ Procedure of removing contact lens deposition

4. Definition:
◦ CL deposits: any lens surface coating or matrix formation which is not flushed or rinsed from a lens by
tears during blinking.
◦ TYPES
◦ According to position
◦ External deposits
eye make up , air pollutants, patients finger
◦ Internal deposits
◦ Tear components—protein , lipid, mucin and .etc.

5. ◦According to nature
◦ Organic deposits
 protein
 lipid
◦ In organic deposits
◦ Environmental deposits

6. ◦ How do deposits form on contact lens surface?
 interaction between lens and content of tears
Evaporation of tears leaves residue on lens.
Deposits originate from tear film immediately start to form on the lens and these
increase and vary over time.
Deposits also originate from external sources such as patients finger.

7. Organic deposits
◦ The organic deposits are the proteins ,lipids ,carbohydrates, pigments of organic origin, and
deposits composed of micro-organisms with other substances.
◦
◦ protein deposits
◦ Protein deposits on contact lens make them un-comfortable, irritating and itchy.
◦ They can make your vision blurry and may lead to conjunctivitis .
◦ There are two types of protein deposits on your tears.
◦ Native proteins are not visible and are easily removed when cleaning your lenses.

9. ◦ Denatured proteins that make the lenses hazy.
◦ If you are experiencing difficulties with your contact lenses, or you believe you may have any
infection, discontinue wearing your lenses and contact your eye doctor.
◦ removing the protein
◦ Enzymatic cleaners can remove the protein from your lenses.
◦ After removing and cleaning your lenses, place them in the enzyme cleaner to soak for two
hours.
◦ After two hours, clean and rinse them again.

10. ◦ Then place in disinfecting solution overnight.
◦ Its recommended that protein be removed once a week.
◦ You should use the lens products recommended by your eye doctor
◦ Enzymes can also remove other types of deposits if they are incorporated in the
protein deposits.

11. How protein deposits get denatured.
◦ Environmental factors
◦ Heat
◦ Drying
◦ Oxidation
◦ UV-light

12. Procedure of removing…
◦ Enzymatic protein removers contain one of the following.
 papain.
 pancreatin
 subtilisin A&B
Papain
• Protease I,e enzyme that act as protein specifically.
• Derived from papaya plant.

13. ◦ Usually have slightly unpleasant odour due to the inclusion of cysteine.
◦ binds to contact lens material and can cause sensitivity reaction .
◦ Short 15 min soaking time possible.
◦ subtilisin A&B
◦ Proteases
◦ Subtilisin A formulated specifically for use in hydrogen peroxide lens care systems.
◦ Subtilisin B is formulated for use in conventional chemical and thermal systems.

14. Lipid deposits…
◦ symptoms
Non-to mild discomfort, reduced vision.
◦ Signs
◦ Shimmering, oily film on the lens surface
◦ Etiology
◦ accumulation of lipid on soft lens surface.
◦ May be from poor tear film quality exacerbated by lid margin disease.
◦ Skin care products may deposit on lens during handling.

16. ◦ Prevalence
◦ Common
◦ DDX
◦ Separate from protein film by texture, uniformity and colour.

17. Lipid removing…
◦ Consider switching to DD lenses. DOLCE AND GABBANA
◦ Change lens material.
◦ Review rub and rinse routine.
◦ Switch to solution with surfactants.

18. In organic deposits..
◦ The in organic deposits are calcium salts, phosphates and carbonates of calcium,
ferrous oxide, salts and pigments derived from in organic chemicals.
◦ The most common types of in-organic deposits are “jelly bumps” which occurs most
frequently on extended wear contact lenses.
◦ The jelly bumps are round, nodular deposits composed primarily of calcium, lipids and
cholesterol .
◦ These deposits are difficult to remove from the contact lens.

19. Environmental deposits
◦ The most common environmental deposits are rust spots and particles from cosmetics.
◦ Rust spots are caused generally by the use of tap water or by foreign matter in the environment
.
◦ They are generally orange and circular .
◦ Deposits from cosmetics have an iridescent.
◦ Greasy appearance and may be caused by
◦ mascara
◦ hair spray
◦ creams

21. Effects of deposits
◦ Deposits can cause dis-comfort and visual disturbances.
◦ They may also produce mechanical abrasions
◦ Also can cause immuno-allergic reactions and facilitate adherence of micro-organisms
◦ And subsequently cause infection
◦ The upper eye lid may be irritated by the deposit or grab onto it, causing the lens to decenter.
◦ Can cause corneal diseases if the patient is non-educated.

22. Deposit complication
◦ Reduced visual acuity
◦ Lens dryness proteins repel water and the lens may dry up more easily.
◦ Irritation and reduced comfort can cause shortened wear time .
◦ Causes allergic response.
◦ Micro-organisms attachment to deposits may cause eye infection.