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29 Cards in this Set
- Front
- Back
what are symptoms that is associated with reduced NPC
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1. diplopia
2. skipping lines 3. poor reading comprehension |
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what are the FOUR types of convergences
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1. tonic: physiological resting position (dist. finding)
2. proximal: arise from psychological awareness of obj 3. accommodative: 4. fusional: responds to keep obj of regard single |
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findings of convergence insufficiencies
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1. orthophoria to low exophoria at distance
2. high exophoria at near 3. greater than morgans norm for near of 3PD XP 4. receded NPC 5. low BO ranges 6. low NRA |
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findings of convergence excess
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1. orthophoria to low esophoria at distance
2. esophoria at near (high) 3. high lag 4. low BI range 5. low PRA 6. NPC normal |
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when someone does not have enough accommodative reserves they exhibit characteristic symptoms...
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1. fatigues during near tasks
2. blurring of near vision 3. inability to read in dim light |
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what are the FOUR types of accommodation
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1. blur driven
2. convergent 3. tonic 4. proximal |
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what are the FIVE types of anomalies of accommodation
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1. fatigue of accommodation
2. failure of accommodation 3. accommodative inertia 4. paralysis of accommodation 5. accommodative excess |
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fatigue of accommodation:
definition? common in...? |
1. inability of ciliary muscle to maintain contraction while viewing a near obj, resultant decrease in accommodative response
2. more common in HYPEROPES (greater demand) 3. increased lag |
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failure of accommodation:
definition? sub-divisions? |
inability to produce or maintain an appropriate accommodative response
sub-division: 1. accommodative insufficiency 2. ill sustained accommodation |
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Accommodative Inertia:
definition? |
1. problems changing their accommodation (~1sec)
2. work induced myopia 3. trouble relaxing accommodation after prolonged periods on near point work |
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Paralysis of accommodation:
laterality? what happens to pupil? |
1. Unilateral, bilateral, sudden onset
2. Pupil mydriasis 3. Paralysis is extreme insufficiency |
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Accommodative Excess:
what happens? |
1. spasm
2. pseudomyopia 3. hyperaccommodation, high lead (greater than 40D) |
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what is Hofstetter's Formulae
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MAX=25-0.4(age)
AVG=18.5-0.3(age) MIN=15.5-0.25(age) |
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accommodation in relation to distant targets?
near targets? |
1. For distant targets we tend to over-accommodate (LEAD)
2. For close near point objects the response is slightly less than the stimulus (LAG) |
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in BCC, what is the situation when the patient reports seeing the HORIZONTAL lines as clearer
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the patient was initially under accommodating and therefore there is a LAG of accommodation
ADD PLUS!! |
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in BCC, what is the situation when the patient reports seeing the VERITCAL lines as clearer
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The patient was initially over accommodating exhibiting a LEAD of accommodation
ADD MINUS!! |
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for young actively accommodating patients what must you do before doing BCC...why
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1. introduce a +1.00D fogging lens before introducing the target
2. stabilizes the accommodative response, somewhat |
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confrontation fields test...
amsler grid test... |
confrontation field:
1. test central 30 deg amsler grid: 1. test 10 deg from either side of fixation |
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amsler gris set up?
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1. 30cm test distance
2. bright illumination 3. wear BCVA |
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amsler grid for absolute presbyopes
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1. at 28-30 cm need a +3.00 add
2. at 40cm need a +2.50 add |
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ARMD is characterized by what symptoms
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1. drusen formation
2. RPE abnormalities 3. geographic atrophy of RPE and choriocapillaris 4. neovascular (exudates) maculopathy |
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PHP uses what type of acuity? what is it used for?
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1. VERNIER ACUITY
2. detection/quantification of hyperacuity defects 3. detects progression of intermediate dry to early wet AMD |
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what is a more significant factor in early diagnosis for ARMD
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LESION SIZE was a more significant factor affecting treatment benefit than either:
1. lesion composition 2. baseline visual acuity |
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what are morgans norms for distance base-in limits
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blur: X
break: 5-9 recovery: 3-5 |
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what are morgans norms for distance base-out limits
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blur: 7-11
break: 15-23 recovery: 8-12 |
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what are morgans norms for near base-out limits
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blur: 14-20 or NO BLUR
break: 18-24 recovery: 7-15 |
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what are morgans norms for near base-in limits
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blur: 11-15 or NO BLUR
break: 19-25 recovery: 10-16 |
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in trial frame what goes inside the back well
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largest sphere power
reduce VD |
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in trial frame what goes inside the front wells
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1. low power lens should go in front wells
2. cylinder should be place in the last well, closest to pt's eye (help w/ axis adjustment) |