This document discusses anomalies of accommodation, including diminished or deficient accommodation (presbyopia, cycloplegia, insufficiency), and increased accommodation (excessive accommodation, spasm). Presbyopia is an age-related decrease in accommodation due to hardening of the lens or weakening of the ciliary muscles. Treatment includes optical corrections like glasses or surgery. Insufficiency of accommodation can be due to premature lens sclerosis or ciliary muscle weakness from various systemic or local causes. Treatment addresses the underlying cause and includes near vision corrections. Excessive accommodation can occur in young hyperopes or myopes doing excessive near work, while spasm of accommodation is an abnormal excessive accommodation outside voluntary control.
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Anomalies of accommodation
1.
2. PRESENTATION LAY OUT
Accommodation…….. Overview
Anomalies of accommodation …..classification
Clinical presentation
Management
3. ANOMALY
Anomaly means a deviation from the normal state .
This deviation may be above or below the normal
state.
In case of accommodation, anomalies simply
comprises of increase or decrease in accommodation.
4. ANOMALIES OF ACCOMMODATION
CLASSIFICATION
A: DIMINISHED OR DEFICIENT ACCOMMODATION
1. physiological (presbyopia)
2. pharmacological (cycloplegia)
3. pathological
insufficiency of acc;
ill-sustained acc;
inertia of acc;
paralysis of acc;
B: INCREASED ACCOMMODATION
1. excessive accommodation
2. spasm of accommodation
5. DIMINSHED ACCOMMODATION
PRESBYOPIA
It is not a state of refractive error but a condition
of physiological insufficiency of accommodation.
The condition of failing near vision due to age
related decrease in the amplitude of
accommodation or
Increase in punctum proximum is called
presbyopia.
6.
7. Pathophysiology of presbyopia
With increasing age there is a decrease in the
accommodative power of the crystalline lens due to
sclerosis ( hardening) of the crystalline lens with
increasing age and/ or
age related decrease in the power of ciliary's muscles
8.
9. Symptoms of presbyopia
Difficulty in near vision
Asthenopic symptoms
Intermittent diplopia at near ……..due to the
interrelationship b/w accommodation and
convergence.
10.
11. Treatment of presbyopia
Optical
spectacles
contact lenses
Surgical
IOL,s with near add
LTK laser thermal keratoplasty
12.
13. INSUFFICENCY OF ACCOMMODATION
DEF;
When the accommodative power is significantly less
than the normal physiological limits for the patient's
age.
Should not be confused with presbyopia in which the
physiological insufficiency of acc is normal for the pt,
age.
14. Causes of accommodative insufficiency
1.Premature sclerosis of lens
2. weakness of CM either due to
systemic causes e.g malnutrition ,DM ,
pregnancy ,anemia ,toxaemia and stress.
local causes e.g POAG,
15. Clinical features
Asthenopic symptoms such as headache ,fatigue,
irritabilty of the eyes while doing near work
The pt remains comfortable if near work is not
attempted.
Near work is blurred and difficult.
Intermittent diplopia for near.
16. Clinical features All these symptoms are stable in accommodative
insufficiency of lenticular origin.however
When the condition is due to CM weakness,then with
improvement in GH,or relaxation from overwork or
worry, the symptoms may considerably improve.
17. Treatment
Treatment of the cause (systemic causes)
Near vision spectacles
Weakest convex lenses should be given after
distance correction if any .
BI prisms if there is associated convergence
insufficiency.
When convergence excess is associated then give
full spherical correction.
18. Accommodation exercises
Accommodation exercises are helpful when the
general debility has passed and the lenticular
sclerosis is not the cause of diminished
accommodation.
Accommodation exercises are carried out
binocularly when there is associated convergence
weakness otherwise
One eye should be covered while exercising.
19. Accommodation test card exercises
It is the most simple exercise
The card consist of a black vertical line drawn on a
white card.
The pt should be instructed to hold the card at a
considerable distance and then bring it closer until
the line appears blurred .
He should be encouraged to attempt to bring his near
point as close as possible
21. ILL-SUSTAINED ACCOMMODATION
It is also known as a condition of accommodation
fatigue may be defined as the situation in which
although the range of a accommodation is normal but
it cannot be sustained for sufficient time period.
It causes a tendency for the near point of
accommodation of the patient to recede during close
work.
22. AETIOLOGY
It is the initial stage of true insufficiency.
Accommodation fatigue is characteristically known to
occur in the following conditions.
Stage of convalescence from debilitating illness
Stage of general tiredness
When patient is relaxed in the bed
23. CLINICAL FEATURES
Since it is initial stage of true insufficiency, the
symptoms are largely the same. Typically the patients
complain that while doing near work, they start feeling
tired very soon. Their near point gradually recedes and
the near visions become blurred.
24. TREATMENT
Avoiding the near work during situation described in
etiology
General tonic measures.
Improve visual hygiene with particular reference to
conditions of illumination and posture during study.
25. ACCOMMODATION INERTIA
It is the condition in which there is difficulty in
adjusting the accommodation according to the
distance of regard so as to gain clear vision .It is
comparatively rare condition
26. CLINICAL FEATURES
Patient typically complains that it takes some time and
involves some definite effort for him to focus a near
object after looking at a distance. Usually this
condition does not assume any serious symptoms, but
occasionally may give rise to some trouble and
annoyance
29. CAUSES
Drug induced cycloplegia results due to the
effect of parasympatholytics drugs such as
atropine, homatropine and others.
Internal ophthalmoplegia, it means paralysis of
sphincter pupillae muscles and ciliary muscle may
result from neuritis associated with diabetes,
chronic alcoholism ,cerebral or meningial diseases
including even a mild head injury
30. CAUSES
Paralysis of accommodation as component of
complete 3rd nerve paralysis may occur due to
intracranial or orbital causes. the lesion may traumatic
inflammatory or neoplastic
31. CLINICAL FEATURES
Blurring of near vision
It is the main complaint in previously emmetropic
or hypermetropic patient. Blurring of vision may
not be marked in myopic patient
Photophobia It is due to accompanying
mydriasis.Usually associated with blurring of near
vision.
On examination there is abnormal receding of
NPA and markedly decrease range of
accommodation
32. TREATMENT
Treat the systemic diseases such as diphtheria, syphilis
etc.
Self recovery occur in drug induce paralysis.
Dark glasses to reduce the glare
In permanent paralysis plus lenses for near vision.
34. EXCESSIVE ACCOMMODATION
It is a situation in which an individual exerts more
than normal accommodation for performing certain
near work. it is with in the voluntary control of the
individual and is an intermittent process.
35. CAUSES
Certain degree of excessive accommodation is
frequently noted under following circumstances
Young hypermetropes frequently use excessive
accommodation as a physiological adaptation to
attain clear vision.
Young myopes performing excessive near work
may also use excessive accommodation in
association with excessive convergence.
36. CAUSES Astigmatic errors in young persons may also be
occasionally with the use of excessive accommodation.
Presbyopes in the beginning also use excessive
accommodation to accomplish near work.
Use of improper or ill-fitting spectacles may also
cause use of excessive accommodation
37. Precipitating factors
Large amount of near work.
Habitual near work in deficient or excessive
illumination.
General debility
Physical or mental ill health
38. CLINICAL FEATURES
Blurred vision of varying degree due to induced
pseudomyopia
Symptoms of accommodative asthenopia
Both far point ant near point are brought nearer to the
eye
Near vision also suffers in the more marked degrees
and after reading for some time the printed page
becomes confused and clears up only after a temporary
rest.
39. TREATMENT
The treatment is usually effective with good prognosis
Optical treatment correct refractive error while
performing cycloplegic refraction
General treatment near work should be forbidden
for a period
General conditions of the patient’s health should
receive special attention
40. SPASM OF ACCOMMODATION
Spasm of accommodation is a continuous prolonged
use of excessive accommodation or it refers to the
abnormally excessive accommodation which is out of
the voluntary control of the individual.
41. Causes
Drug induced spasm of accommodation is known to
occur after use of strong miotics such as echothiophate
Spontaneous spasm of accommodation
Occasionally found in children usually in uncorrected
hypermetropes but also in astigmatic and even in myopes
children.
It usually occur when the eyes are used for excessive near
work in unfavorable conditions such as bad illumination ,
bad reading position, lowered vitality , state of neurosis ,
mental stress and anxiety.
Iridocyclitis may be associated with ciliary spasm.
42. Causes
Spasm of near reflex is a clinical syndrome often
seen in disturbed and tense individuals. who
presents with
Excessive accommodation
Excessive convergence and
Meiosis
Lesion of brainstem e.g. encephalitis and
meningitis may be associated with ciliary spasm
Toxic reaction exogenous poisons e.g.
sulphonamides, arsenic or even smoking can
sometime cause spasm of accommodation
43. Clinical features
Varying blurred vision due to induced pseudomyopia
Asthenopic symptoms are more marked than the
visual symptoms (blurr).
Headache and brow ache are typical features.
NPA is abnormally close.
Macropsia may occur.
44. TREATMENT
Relaxation of ciliary muscles
The most effective method of treatment is the
production of complete ciliary paralysis with atropine .
The cycloplegia should be kept for 4 weeks or more.
Optical treatment
correcting spectacle should be worn immediately
when eyes are used again after period of cycloplegia.
45. TREATMENT
General treatment
Near work should be forbidden for a period
The general condition of the patient health should
receive special attention.
Therefore, a holiday with a change of air usually has a
greater effect than anything else.