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Contact Lenses > Contact Lens Equipment and Measurements : Keratometer / Slit Lamp > Flashcards

Contact Lens Equipment and Measurements : Keratometer / Slit Lamp Flashcards

1
Q

What describes the curvature of a surface by stating the length of the curve’s radius?

A

Radius of Curvature

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2
Q

What does a short radius mean?

A

Steeper Curve

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3
Q

What does a long radius mean?

A

Flatter Curve

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4
Q

What will the radius be if the curve is steep?

A

Short

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5
Q

What will the radius be if the curve is flat?

A

Long

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6
Q

What is radius of curvature measured in?

A

mm

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7
Q

What determines corneal power?

A

Curvature

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8
Q

What does the radius of curvature converts to?

A

Dioptric Power

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9
Q

What keratometer provides power in values in dioptres?

A

Manual

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10
Q

What keratometer provides values in mm and dioptres?

A

Automater

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11
Q

What is the conversion formula?

A

P=(n-1)/r

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12
Q

What is P in the conversion formula?

A

Curvature power in dioptres

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13
Q

What is N in the conversion formula?

A

Index of refraction

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14
Q

What is R in the conversion formula?

A

Radius of curvature

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15
Q

What should you convert the radius of curvature to?

A

meters

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16
Q

What is the index of refraction for the eye?

A

1.3375

17
Q

What is the average corneal power value?

A

43.50D

18
Q

If the value is high, will the cornea be steeper or flatter?

A

Steeper

19
Q

If the value is low, will the cornea be steeper or flatter?

A

Flatter

20
Q

What device measures corneal curvature?

Central 3mm

A

Keratometer

21
Q

What are the purposes of keratometer?

A

Measures amount and type of astigmatism
Information to help select contact lens base curve
Corneal distortion
Assess tear layer

22
Q

Is the cornea a convex or concave mirrored surface?

A

Convex

23
Q

What type of astigmatism is when the horizontal is the flatter meridian?

A

With the Rule

24
Q

What type of astigmatism is when the vertical is the flatter meridian?

A

Against the Rule

25
Q

What is the purpose of slit lamp?

A

Examine anterior and posterior segment of eye

26
Q

Can you take photos with slit lamp?

A

Yes

27
Q

What can you evaluate with slit lamp? examples?

A

Evaluate contact lenses

Evaluate for dry eyes

Contact Lenses (18 decks)

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