Symptomatic phoria

Question 1

what is a phoria

Answer 1

tendency of eyes to drift but you can keep it in check via fusion

Question 2

what are fusional reserves

Answer 2

a measure of how much mergence a person has in reserve that can be used to overcome a heterophobia

Question 3

what are some example in history that may suggest decompensated phobia

Answer 3

• dip , gradual onset
• HA
• covering ine ey e
• towards the end go the day
• px reporting eyes tend to drift - suggesting - intermittent tropic stage
• if decompensated then may have head tilt or face turn so adapting or more longstanding

Question 4

what are the causes of decompensated phoria

Answer 4

• uncorrected rx
  -poor/inadequate fusional reserves
• tiredness
  -illness
  -trauma
  -ptolonged near work

Question 5

what are the methods to treat a decompensating phoria

Answer 5

1) refractive error
2) excerices0 seterograms useful when small phoria
3) prism - fresnel is best option to allow px to live with the prism to adapt to what is best - it will keep fluctuating and cost

4)BOTULINIUM toxin
5) surgery

Question 6

what is fresnel prism

Answer 6

• lens manufactured using concentric rings of variable angle prism
• the greater the number if rings- the better will be the resolving poor
• parallel bamds of constant angle prism are ways of producing very prowrful prisms with minimal thickness

Question 7

what types of esophoria

Answer 7

convergence excess
divergence excess
mixed
causes
anatomical
high rx- hyper emmetropia
AC/A ratio high
weak divergent fusional range

Question 8

what are types of exophoria

Answer 8

divergence excess
convergence weakness
non specific

causes wide pd
refrACTIVE