unit 6 Flashcards

1
Q

Prior to contact lens fitting

A
  • Visual acuity
    o glasses vs cl
  • Refraction
  • Corneal curvature
    o steep vs flat
  • Corneal diameter
    o Horizontal visible iris diameter (HVID) is 1.5mm smaller than corneal diameter
    o Slit lamp or topographer
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2
Q

Slit lamp exam- what to check

A
  • Lids and lashes
    o Blepharitis/MGD -> Dryness, discomfort, deposits
  • Lid margins
    o No entropion/ectropion (lids turning inwards/lids turning outwards)
  • Eyelid position
    o Scleral show (more visible scleral than normal)
    o Small aperture
    o Tight eyelids
  • Tear film
  • Bulbar conjunctiva
    o Pterygia/pinguecula (growth on the conjunctiva)
  • Palpebral conjunctiva
    o Papillae
  • Cornea
    o Neovascularization (not enough oxygen getting to the cornea)
    o Scars
    o Staining
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3
Q

Prescription Consideration

A
  • Sphere power
    o >4.00
  • Astigmatism power
    o >0.75
  • Astigmatism axis
  • Add power (presbyopia)
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4
Q

Should high minus in glasses be higher or lower in CL

A

should be lower in CL

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5
Q

So if the vertex distance is 12mm what should the presciprtion be for a -8.00 and +7.00

A

-8.00 in glasses are going to turn into -7.25
+7.00 in glasses will turn into +7.50
So when it is a minus lens it should increase by 0.25 and if it is a plus lens it should increease by 0.50

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6
Q

Is there a -3.00 astigmatism CL available?

A

No, the closet is -2.75

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7
Q

Other Considerations for CL

A
  • Expectations/motivation
  • Hobbies/lifestyle
  • Work
  • Medical history/medication
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