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CL > EST: preliminary considerations and examinations > Flashcards

EST: preliminary considerations and examinations Flashcards

1
Q

What are the 10 things to discuss with PX in preliminary section?

A
  1. Assess suitability
  2. Understand Expectations
  3. Reasons for CL wear
  4. General/Ocular health
  5. Prev CL history
  6. Lifestyle
  7. Occupational and environmental factors
  8. Outline of fitting procedure
  9. What is required in aftercare, hygiene and lens care
  10. Fees
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2
Q

What are the 3 indications and 4 contraindications for CL in terms of vision

A

Indications:

  1. Anisometropia
  2. High rx
  3. Failures with refractive surgery

Contraindications:

  1. Low rx
  2. VA with lenses worse than spex
  3. Irregular astigmatism
  4. Prism required horizontally or >3 prism Dioptres vertically
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3
Q

What are the 2 indication and 1 contraindication for CL in terms of occupation

A

Indication:

  1. Stage performers
  2. Flight attendants

Contra:
Where legal constraints apply e.g pilots, fire brigade, Chem lab tech

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4
Q

What are the 2 indications and 1 contraindications for CL in terms of cosmetics

A

Indications:

  1. To avoid specs
  2. To change eye colour

Contra:
1. Active infection/ pathology

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5
Q

What are the 1 indications and 5 contraindications for CL in terms of medical/dryness

A

Indication:
Bandage

Contra:

  1. Chronic allergies and antihistamine use
  2. Systemic diseases with complicate CL wear
  3. Autoimmune diseases/immunocompromised
  4. Poor tear quality and quantity
  5. Giant papillary conjunctivitis
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6
Q

What are the 1 indications and 3 contraindications for CL in terms of psychological

A

Indications:
Cannot accept wearing specs

Contra:

  1. Cannot accept idea of lens on eye
  2. Cannot tolerate any level of discomfort
  3. Total perfectionist
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7
Q

What are the 3 indications and 3 contraindications for CL in terms of others

A

Indications:

  1. Sports
  2. Hobbies
  3. Occupation

Contra:

  1. Poor hygiene
  2. Lack of motivation (may lead to non-compliance)
  3. Dry, dusty environments
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8
Q

What are 6 advantages of hydrogel lenses ?

A
  1. Excellent initial comfort
  2. Minimal adaptation time
  3. Occasional wear is ok
  4. Disposable
  5. Low incidence of Edema, lacrimation, flare and photophobia
  6. Long wearing time is ok
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9
Q

What are 6 disadvantages of hydrogel CLs

A
  1. Reduced VA with incorrect astig
  2. Deposit prone
  3. Oxygen transmission lesser compared to SiHy (lower dk)
  4. Less hydration
  5. Increased risk of bacterial contamination
  6. Corneal vascularisation with thicker or lower water content lenses
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10
Q

What are 4 advantages of SiHy?

A
  1. Excellent O2 permeability
  2. Very Low risk of vascularisation
  3. Suitable for extended wear
  4. Less hydration because of lower water content
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11
Q

What are 3 disadvantages of SiHy?

A
  1. Greater incidence of arcuate staining
  2. More liable to lipid deposits, tend to attract preservatives
  3. More expensive
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12
Q

What are the 4 advantages of RGP?

A
  1. Correction if astigmatism
  2. Low risk of CL complication
  3. Suitable for extended wear
  4. Less hydration
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13
Q

What are 3 disadvantages of RGP

A
  1. Require adaptation
  2. Easier to dislodge from cornea
  3. Complaint of transient flare
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14
Q

List 4 indications and 3 contraindications for RGP

A

Indication:

  1. High astig/irregular cornea
  2. OrthoK
  3. Dry eyes
  4. Unsuccessful SCL wearer (Vision or complications)

Contra:
Contact sports
Dusty
Occasional lens wear

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15
Q

what are 7 decisions for trial fit we have to make for final evaluation?

A

Decisions is made on specific lens type to trial fi:

  1. Lens type: RGP / SCL / Toric SCL / Cosmetic lenses etc…
  2. Modality (Daily / Monthly / Biweekly / Conventional)
  3. Wearing time
  4. Lens cleaning regimen
  5. Brand of lens
  6. Budget
  7. Material of lens
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16
Q

compare hydrogel and sihy in terms of DK, water content, modulus, and wettability

A

hydrogel:
lower dk
water content 30-78%
lower modulus (harder to handle, more comfy)
more hydrophillic, more wettable but attracts more protein)

SiHy:
higher dk
water content 33-56%
higher modulus (easier to handle, less comfy)
less wettable (attracts more lipids)

CL (9 decks)

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