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year 2 clinical studies and dispensing > Dynamic ret and Near Add > Flashcards

Dynamic ret and Near Add Flashcards

1
Q

What is accommodative lag?

A

When less accommodation is being used than is needed (underuse)
Patient can see further away than expected, is looking ‘behind’ the target

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2
Q

What is considered ‘normal’ lag for pre-presbyopes?

A

+0.25 to +0.75D

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3
Q

What is accommodative lead?

A

More accommodation is used than needed (overuse)
Patient can see a target closer than expected

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4
Q

How do you work out the accommodative response?

A

Expected accommodation - actual accommodation

e.g. if expected = +3.00, and neutrality is at +2.00, response = +1.00D

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5
Q

If lag is over +1.00D, what could be the cause?

A

Accommodative dysfunction
Overminused rx (causes accommodation)
Near ESOP (converging more bc of reduced accomm, trying to induce accomm)
Presbyope

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6
Q

If lead is over -0.25D, what could be the cause?

A

Near EXOP
Accommodative spasm
Latent hyperopia
Under corrected myope

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7
Q

What is the dioptric value of 50cm?

A

2D

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8
Q

What is the dioptric value of 25cm?

A

4D

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9
Q

What is the dioptric value of 75cm?

A

1.25D

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10
Q

What is the dioptric value of 20cm?

A

5D

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11
Q

What is the dioptric value of 33cm?

A

3D

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12
Q

What is the dioptric value of 40cm?

A

2.50D

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13
Q

What is the dioptric value of 80cm?

A

1.25D

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14
Q

What is the dioptric value of 67cm?

A

1.50D

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15
Q

What is the dioptric value of 44cm?

A

2.25D

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16
Q

What is the dioptric value of 57cm?

A

1.75D

17
Q

What is the normal AOA and near point for a 5 year old?

A

AOA: 15D
Near point: 5cm

18
Q

What is the normal AOA and near point for a 10 year old?

A

AOA: 12.50D
Near point: 8cm

19
Q

What is the normal AOA and near point for a 20 year old?

A

AOA: 9.75D
Near point: 10cm

20
Q

What is the normal AOA and near point for a 30 year old?

A

AOA: 7.25D
Near point: 14cm

21
Q

What is the normal AOA and near point for a 40 year old?

A

AOA: 4D
Near point: 25cm

22
Q

What is the normal AOA and near point for a 50 year old?

A

AOA: 2.50D
Near point: 40cm

23
Q

What is the normal AOA and near point for a 60 year old?

A

AOA: 1.25D
Near point: 80cm

24
Q

What is the normal AOA and near point for a 70 year old?

A

AOA: 0.50D
Near point: 200cm

25
Q

What is the normal AOA and near point for a 75 year old?

A

AOA: 0D
Near point: Infinity

26
Q

How much of the AoA is used at once most of the time?

A

Half to a third

27
Q

When does presbyopia become clinically significant?

A

In px’s 40s

28
Q

What can cause earlier clinically significant presbyopia?

A

Hot climate
Short arms
Short WD
Hyperopes

year 2 clinical studies and dispensing (14 decks)

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