Introduction to retinal examination.ppt...
Transcript of Introduction to retinal examination.ppt...
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Retinal Examination
Anthony Cavallerano, O.D.
VA Boston Health Care System
The New England College of Optometry
Boston Massachusetts
University of Milan
December 2003
University of Milan - Bicocca
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Fundus Anatomy and Landmark of the Retina
Posterior Pole: -optic nerve
-macula
Equator: vortex veins
Peripheral retina: ora serrata
long posterior ciliary nerves
short posterior ciliary nerves
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Posterior pole
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Fundus Anatomy and Landmark of the Retina
Posterior Pole: -optic nerve
-macula
Equator: vortex veins
Peripheral retina: ora serrata
long posterior ciliary nerves
short posterior ciliary nerves
+ +Draf
t Only
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Equator
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Fundus Anatomy and Landmark of the Retina
Posterior Pole: -optic nerve
-macula
Equator: vortex veins
Peripheral retina: ora serrata
long posterior ciliary nerves
short posterior ciliary nerves
+ +Draf
t Only
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Oraserrata
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Fundus Anatomy and Landmark of the Retina
Posterior Pole: -optic nerve
-macula
Equator: vortex veins
Peripheral retina: ora serrata
long posterior ciliary nerves
short posterior ciliary nerves
+ +Draf
t Only
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There are various methods of examining the
retina.
These include:
direct ophthalmoscopy
monocular indirect ophthalmoscopy
binocular indirect ophthalmoscopy
A comparison chart of the 3 instruments can demonstrate
the advantage and disadvantages of the 3 instrumentsDraft O
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1 DD :vertical
1 DD: horizontal
Lesion size/distance in discdiameters
Optic nerve
Eg: lesion is 1/2DD in size Hx V and 2DD away superiortemporal from the optic nerve head
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DirectOphthalomoscopy
MonocularIndirectOphthalmoscopy
Binocular IndirectOphthalmoscopy
Image Upright
Magnification 15x (high)
Field of View 10 degrees
Equivalent inDD size
2DD
Pupil size Undilated
Stereopsis None
Resolution good
WorkingDistance
Very short
MediaEvaluation
Excellent
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Monocular Indirect Ophthalmoscope
Instrument:
• Magnifying eyepiece
• Relay system re-inverts image to a real one
• Image is focused using eye pieceDraft O
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ExaminerMagnifying
eyepiece
Relay
Lens
System
Patient
LightSource
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Indication of use:
• Small pupils
• Uncooperative children
• Patients intolerant to bright illumination
• One handed technique
• Person who is monocular
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DirectOphthalomoscopy
MonocularIndirectOphthalmoscopy
Binocular IndirectOphthalmoscopy
Image Upright
Magnification 5x fixed mag
Field of View 40-45 degrees
Equivalent inDD size
8DD
Pupil size Undilated
Stereopsis No stereopsis
Resolution Fair
WorkingDistance
Short distance
MediaEvaluation
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Binocular Indirect Ophthalmoscope
Instrument: consists of a:
optical viewing system
rheostat illuminating system
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Optics:
• Light from B.I.O. directed into patients eye
• Reflected beams from retina are focused usinga high plus lens
• Aerial image produced
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DirectOphthalomoscopy
MonocularIndirectOphthalmoscopy
Binocular IndirectOphthalmoscopy
Image Inverted
Magnification 2.5x (variable)
Field of View 40-45 degrees
Equivalent inDD size
8DD
Pupil size Dilated
Stereopsis yes
Resolution Excellent
WorkingDistance
Arms length
MediaEvaluation
No
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Condensing Lens:
Magnification: F eye / F condensing = Mag x
Lens size Magnification Field of View
20D 3x less than 30D lens
30D 2x greater than 20 lens
15D 4x less than 20 and 30Dlens
2.2D mag equivalentof 20D
field of view equivalentof 30D
Magnification versus field of view
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Technique
PD measurement
Location of light source
Headband fit vs. spectacle
Obtain stereopsis
Holding the condensing lens
Examiner and patient positionDraft O
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Technique
PD measurement
Location of light source
Headband fit vs. spectacle
Obtain stereopsis
Holding the condensing lens
Examiner and patient positionDraft O
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Technique
PD measurement
Location of light source
Headband fit vs. spectacle
Obtain stereopsis
Holding the condensing lens
Examiner and patient positionDraft O
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Technique
PD measurement
Location of light source
Headband fit vs. spectacle
Obtain stereopsis
Holding the condensing lens
Examiner and patient positionDraft O
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Technique
PD measurement
Location of light source
Headband fit vs. spectacle
Obtain stereopsis
Holding the condensing lens
Examiner and patient positionDraft O
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Binocular Indirect Ophthalmoscopy
• Holding the condensing lens
• Distance of condensing lens and eye
• Red reflex
• Filling the condensing lens imageDraft O
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Binocular Indirect Ophthalmoscope
• Examine the retina in a chronological order
• Obtain overlapping views
• 9 positions to examine
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eg. To examine the patient’s right eye at the 3 o’clockposition, direct the patient’s gaze to that position (3o’clock)
You record your results in the 3 o’clock position
However in your view at this position everything isinverted and reversed
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Universal (Goldmann) 3-Mirror Lens
Contact technique: lens with slit lampbiomicroscope
Lens placed on the cornea
3- dimensional view obtained
Used both on undilated and dilated pupil
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Patient
Light Source
Slit Lamp
Virtual Image
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Universal (Goldmann) 3-Mirror Lens
Central lens: used for posterior pole evaluation
Trapezoid mirror: for equatorial retinalevaluation
Rectangular mirror: for equator to ora retinalevaluation
Gonio mirror: evaluation of the ora serrata
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Posterior pole
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Universal (Goldmann) 3-Mirror Lens
Central lens: used for posterior pole evaluation
Trapezoid mirror: for equatorial retinal evaluation
Rectangular mirror: for equator to ora retinalevaluation
Gonio mirror: evaluation of the ora serrata
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Equator
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Goldmann 3 Mirror Lens
Central lens: used for posterior pole evaluation
Trapezoid mirror: for equatorial retinalevaluation
Rectangular mirror: for equator to ora retinalevaluation
Gonio mirror: evaluation of the ora serrata
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EquatorOra serrata
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Hand-held Condensing Lens
Advantages:* non-contact
* provides stereopsis
* use with slit lamp biomicroscope
* well illuminated view of theposterior pole
* alternative procedure toGoldmann 3 mirror lensDraf
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Light Source
Biomicroscope
Patient90D Lens
Reversed InvertedAerial Image
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Condensing Lens
* double aspheric lens
* clear or yellow coated
* available in many different powers
* pupil dilation desirable
* lens alignment, visual axis centration, vertexdistancing tilting is needed in this procedureDraf
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Comparison of auxillary lenses
Lens size Magnification Field of View workingdistance fromcornea
60D 1.09 67 degrees 11mm
78D 0.87 68 degrees 7 mm
90D 0.72 69 degrees 6.5mm
Superfield 0.76 116 degrees ----------
Super 66 1.00 96 degrees ----------
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