Clinical evaluation of SQUINT - Directorate of Medical ...dme.ap.nic.in/Clinical evaluation of...
Transcript of Clinical evaluation of SQUINT - Directorate of Medical ...dme.ap.nic.in/Clinical evaluation of...
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SQUINT
Clinical evaluation of
Dr.V.Chandra sekar reddy
Dept. of Squint &Paed.Oph.
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Esodeviation E’ E ET’ ET E(T)’ E(T)
Exodeviation X’ X XT’ XT X(T)’ XT
RT hyper RH’ RH RHT’ RHT RH(T)’RHT
LT Hyper LH’ LH LHT’ LHT LH(T)’LHT
Heterophoria Hetrotropia Intermittant
Near Distance Near Distance Near Distance
Common squint abbreviations
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• Orthophoria..straight eyes
• Heterophoria..Latent squint. Fusional control is always present
• Intermittent tropia..Occational squint.Fusional control is not constantantly
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• Heterotropia.
.Constant squint.fusional control absent
• Esotropia..Cornea deviated nasally
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• Exo..Cornea deviated temporally
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Vertical deviations• Hyper..Cornea deviated upwards
• Hypo..Cornea deviated downwards
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• Incyclo..V.meridian of cornea turned nasally(Intortion)
• Excyclo.. … turned temporally (Extortion)
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Types of squint
Comitant:: Deviation not change with direction of gaze or fixing eye
Incomitant. :Deviation varies with direction of gaze or fixing eye
Paralytic or restrictive
Alternating
Monocular
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congenital acquired
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Complaints
• Squinting
• Double vision
• Asthenopia
• Headache
• Unilateral DV
• Abnormal head posture
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Child Exam
1. Alignment - Nystagmus?
2. Palpebral fissures for Epicanthus-Ptosis-size-slant
3. Head size - If you have a question, measure
4. Infant's Response to Surroundings
5. Head Posture - Tilt? Chin Up - Down? Etc.
6. Pupil Size - Response
7. Anything else
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Visual acuity
• Tests for infants…Up to 2 yrs ( It is obvious that these are all objective tests)
1. Fixation preference test2. Grating acuity test3. Optokinetic nystagmus (OKN) test4. Visual Evoked Potentials (VEP )
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Fixation preference test
CSM method
• Central
• steady
• Maintained
Attractive object on TV monitors
Toys
Bunch of keys
Spot light
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Grating acuity tests
1.Teller acuity cards
2.Forced preferential looking (PFL)
• 6/240 at birth
• 6/60 at 3mths
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•
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•
Contrast sensitivity
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• Optokinetic nystagmus (OKN) test
• Smallest stripe that produces nystagmus
• 6/120 at Birth
• 6/60 in 6mths child
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VEP
• Records cortical potentials to visual stimuli
• 6/120…1 mth
• 6/6 at 6 mths
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2-4yrsVerbal children
• Matching tests
• Illeterate E
• Pictures
• Symbols
• Numbers
• 6/9
Bust vision tests
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4-6yrs
Conventional subjective tests
• Snellens
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6/120 6/60 6/36 20-30mths
6/120 6/60 6/36 24-36mths
6/120 6/60 6/6-6/12 6-12mths
OKN
Preferential looking
VEP
1mth 2mths 6mths Age 6/6 METHOD
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; A) Sheridan´s Ball test B) Teller Acuity Cards, C) BUST -D distance vision test, D) Sheridan - Gardiner´s single symbol test, E-F) LH vision tests, G) HVT visual acuity line test.
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Motor signs
Inspection of eyes
• P.F. Pseudoptosis
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PF
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• Change of PF on moving RT & LT
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Jaw winking
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Pseodo strabismusPseudo strabismus
• Epicanthal fold
• Wide nasal bridge
• Ectopia of macula
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Cross fixation
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• Mongoloid antimangoloid
Mongoloid
Level
Anti-mongoloid
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Constant head posture CHPConstant head posture CHP
•Normal Rt 6 th
Rt.4thHead posture in right superior oblique palsy.The chin is down and the head tilted left while the eyes look up to the right. This compensates for both the vertical and the torsional defect.
face right, while the eyes assume levoversion
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•
Brown right eye Face Up - Left
SR palsy or IR restriction one or both eyes chin up
IR palsy with limited depression one or both eyes Chin Down
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•
Nystagmus
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Ocular movements
• Uniocular …..Ductions
• Binocular…….Versions
……..vergences
Convergence
Divergence
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Assesment of Eye movements
• Versions first
• Spinnig or dolls head phen. Vestibular stimulated movements
• Ductions
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Recorded as OveractionRIO Can grade1+ to 4+
Recorded asUnderactionLIR Can grade-1 to -4
Ocular movements
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IO SR underaction
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LE 4th nerve palsy
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RT 3rd N palsy
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I O OA
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BE IO OA
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Normal values for ductions
Limbus test of motility ….Kestenbaum
10mm ..Adduction
Abduction
Depression
5-7mm. Elivation
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Special motor tests
• Forced duction test
• Active forced generation test
• Three step test
• Prism adaptation test
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After topical anesthesia full adduction = No restriction orcan't forcibly complete adduction = restriction
ForcedDuctions
Restrain the OS in abduction, then ask patient to look slowly to the right -Feel pull = Generated force in muscleFeel no or little pull = paretic MR muscle
Generated Force
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3 step test
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Tests for ocular alignment• Cover tests
• Corneal light reflex tests
• Dissimal image tests
• Dissimalar target tests
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Cover tests
• Cover uncover test
• Alternate cover test
• phoria+tropia
• Simultaneous prism cover test
Tropia only
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Prerequisites
• Fixation must be adequate
• Fixation target stimulates acc.
• Must be done for distance & near
• In upgaze & downgaze
• Near & Distance
• With & without glasses
• Palm of hand or occluder for cover
• Indirect occlusion in infants
• Spielman transluscent occluder
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Results of cover test
• Presence of deviation Phoria or tropia
• Type of deviation Eso or Exo
• Eccentric fixation
• Amblyopia
• Degree of alterantion
• Pseudoptosis
• Latent nystagmus
• Measurement of deviation
• Primary & sec. deviation
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Cover uncover testI. Technique
A. fixates on a point
1. Penlight snellen chart
2. Interesting target (e.g. small toy)
A. Cover one eye
B. Observe movement of uncovered eye
C. Cover other eye and repeat test
• Phoria or tropia
• Straight eyes before and after ..phoria
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Cover uncover test
•(No eye movement is shown here) •The occluder covers each eye in turn allowing binocular viewing inbetween occlusion. •The uncovered eye is observed, if it makes a movement a ‘TROPIA has been revealed. •Note any movement of eyes upon removal of the occluder. Note recovery or prescence of alternation
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Alternatecover test
•(No eye movement is shown here) •The occluder covers each eye directly after the other, not allowing binocular viewing to occur. •The uncovered eye is observed, if it makes a movement to take up fixation a ‘PHORIA OR ‘TROPIA has been revealed. ••If no movement was seen on the If no movement was seen on the unilateral test, but movement is unilateral test, but movement is noted on the alternating test, the noted on the alternating test, the patient has apatient has a phoriaphoria
•Note any movement of the eyes upon removal of the occluder, (recovery).
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cover - uncover testno manifest squint (tropia) is present as there is no movement of the non-covered eye upon placement of the occluder. i.e. The left eye doesn’t move when the right is covered and vice -versa . Therefore both eyes must have been fixating correctly.There is however a slight movement of the eyes after theoccluder has been removed from in front of the eyes. This is a movement out (abduction) to take up fixation. Therefore the eye must have assumed an adducted position
Esophoria
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Heterophorias
The Alternate cover test is shown opposite, this shows us the esophoria more clearly, with each eye abducting (moving outwards) when revealed.he eyes must therefore have assumed a convergent position when the occluderinhibited binocular viewing.It is important to note the direction and extent of movement. This could be classified as a moderate esophoria with good recovery.
The recovery is another aspect that needs to be assessed to ascertain degree of compensation..
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LET CUT
•On initial introduction of theoccluder the left eye makes an outward movement to fixate. •When the occluder is removed the patient reverts to right fixation. •When the occluder is placed over the left eye no movement of right eye ispercieved.
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Alter CT LET
•When the occluder is swung between the eyes the revealed eye makes an abducting movement. •When the occluder is finally removed the left eye remains in a convergent position
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RXT
•Cover - Uncover test•The right eye makes an inward movement when the left eye is covered. •There is no movement of the left eye when the right eye is covered. •When the occluder is moved from the left eye, the eyes make a movement to allow left fixation
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Alternate Cover test•Both eyes make an adducting movement when the occluder is moved between the eyes. •When the occluder is removed the eyes revert to fixating with the left eye.
RXT
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Right HYPERphoria
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Left HYPERtropia
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Motor Fusion
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Measurement of deviation
• Objective
PBCT KPBCT
Synaptophore
Corneal reflex test.. Hirschberg
• Subjective
Diplopia tests ;;;Maddox cross M. Wing
Haploscopic test
• In degrees
• In prism diopters
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Limitations
Not suitable non fixing eyesEccentric fixing eye
Combination of prismsGlass prism..prentice position
Plastic prism..frontal planeOptical qualities of prisms
3-4DLatent nystagmus
PBCT• Alt.cover test with prisms
• Rotary ,bars,loose prisms
• Maximum dissociation
• Acc. target Not light source D..6/9 N .N6 or picture
• Phoria and Tropia
• Near & Distance
• Up & Down gaze
• Patch test in exo
• With & without glasses
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Objective tests
• Prism bar cover test
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Measurement in up & down gaze
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V Exo
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A Eso
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Y Exo
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krimsky Prism bar testThis watermark does not appear in the registered version - http://www.clicktoconvert.com
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Synaptophore
IPD
Detect & measure deviation
SMPFusion
Stereopsis
Fusional exercises
Macular function test
After image test
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Corneal reflex test . Hirschberg
• Crude method
• Deviated eye is blind
• 1mm decenteration…7degrees
• KPBCT
• Bruckner test
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Dissimilar image test
• Maddox rod test
• Double maddox rod test
• Maddox wing
• Red filter test
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Convergence
8-10cm or less
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AC/A ratio
• Hetrophoria method
• Gradiant method
• 3-5d
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•Convergence 40^ Near 15^ Dist
•Divergence 12^ Near 6^ Dist
•Vertical Supra/Infra 2-3^ (6^ Total)
•Torsional Incyclo/Excyclo 2-3o (6o Total)
Fusional vergence
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EccentericEccenteric fixationfixation
lVisuoscopy
lHaidinger’s Brushes
lFoveal after image transfer
lScanning laser ophthalmoscopy
lMaxwell's Spot
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Lees test
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Paretic RLRThe larger field is the field made with the right eye fixating--OD is the paretic eye.
Paretic RLRThe larger field is the field made with the right eye fixating--OD is the paretic eye.
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Paretic RLRRLR Palsy
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LLR palsy
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RSO palsy
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Sensory tests
• SMP
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Fusion tests
• Worth four dot test
• Begolini glasses
• Synaptophore
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Bagolini
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Bagolini
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SYNAPTOPHORE SLIDESSYNAPTOPHORE SLIDES
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Tests for stereopsis
• Synaptophore
• Stereograms
• Titmus stereo test
• Random dot stereograms
• TNO test
• Lang test
• Two pencil test
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Random dot
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Contour stereo test
Titmusfly stereo test
• Local stereopsis
• Fly 3600 sec. of arc
• Animals 100-400
• Rings 40 - 800
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Random dot stereo test• Julesz
• Global stetreopsis
• Butterfly test
• Fly 1200-2500
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Randot
lDifferent geometric forms seen
lNo monocular clues
l250-500 seconds of arc
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• Randot E test
• For young children
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• Randot for preschool chidren
• 80-400
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• Randot stereo smile test for infants 6mths
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• The Two Pencil Test of Lang
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