Title: Modern Clinical Optometry Volume II
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2Modern Clinical Optometry
AllDocs 2007
- Craig Thomas, O.D.
- 3900 West Wheatland Road
- Dallas, Texas 75237
- 972-780-7199
- thpckc_at_yahoo.com
3 Medical Eye Care
- Professional Services
- Diagnostic Tests
- Minor Surgical Procedures
- Ophthalmic Ultrasound
- Laboratory Services
4 Diagnostic Tests
- Group 1
- (1) Refraction
- (2) Sensorimotor Examination
- Group 2
- (1) Computerized Corneal Topography
- (2) Specular Endothelial Microscopy
- (3) External Ocular Photography
5 Diagnostic Tests
- Group 3
- (1) Retinal Photography
- (2) Retinal Scanning Laser
- Group 4
- (1) Visual Field Examination
- (2) Color Vision Examination
6 Ophthalmic Ultrasound
- A-Scan Ophthalmic Ultrasound
- B-Scan Ophthalmic Ultrasound
- Corneal Pachymetry
- High Resolution Biomicroscopy
7 Corneal Topography Primer
- The clinical application of Computerized
- Corneal Topography is to determine the
- physical features and shape of the
- anterior surface of the cornea.
- The test is indicated in the identification
- of deep or superficial corneal disorders
- causing (1) irregular astigmatism
- (2) visual impairment.
8 Examination Technique
- Determine test result reliability
- (1) Acquisition of high quality image of
- the air/pre-corneal tear film interface
- (2) Image quality is affected by corneal
- disease, the quality of the tear film,
- or any corneal deformity secondary
- to contact lens wear.
-
Note To improve image quality, instill one drop
of unpreserved artificial tears into each eye
prior to the image capture process.
9 Interpreting the Maps
- Determination of Corneal Shape
- Assessment is accomplished by interpreting
- the color patterns and numeric values
- on the topographic map. Cool colors such
- as green and blue represent lower corneal
- curvatures - while warmer colors such as
- yellow and red suggest higher corneal
- curvatures.
10 Interpreting the Maps
- Axial Map
- The standard topographic map of corneal
- curvature using an axial radius of curvature.
- The map is created by combining colors and
- patterns to represent corneal curvature.
- It shows corneal curvature in diopters, and
- is used to describe the overall corneal shape.
11 Interpreting the Maps
- Tangential Map
- This topographic map also assesses corneal
- shape but, it is more sensitive at
- detecting the precise location of a specific
- defect. Because it is not axis dependent,
- this type of evaluation is better for patients
- with keratoconus, contact lens wearers, and
- patients with irregular astigmatism.
12 Interpreting the Maps
- Determination of Corneal Shape
- (1) Round Corneal Shape
-
- (2) Oval Corneal Shape
- (3) Astigmatic Corneal Shape
- - regular astigmatism
- - irregular astigmatism
13 Interpreting the Maps
- Round Corneas
- The color patterns on round corneas can
- present as concentric rings. These rings,
- radiating from the center of the cornea
- to the limbus, characterize the normal
- flattening that occurs in the corneal
- periphery. Round corneas are present
- in 23 of the general population.
14 Round Cornea
15 Interpreting the Maps
- Oval Corneas
- The color patterns form ellipsoid
- waves that radiate from the center
- of the cornea to the limbus.
- These oval corneas are present in
- 21 of the general population.
16 Oval Cornea
17 Interpreting the Maps
- Astigmatic Corneas
- Corneal astigmatism is expressed in two forms
- (1) Regular Astigmatism
- (2) Irregular Astigmatism
- In corneal astigmatism, the color patterns
- of a topography map form a bowtie
- configuration that can be used to determine
- the regularity of the astigmatism.
18 Regular Limbal Astigmatism
19 Interpreting the Maps
- Regular Astigmatism
- Patients with regular astigmatism can have
- limbal astigmatism or central astigmatism.
- In limbal astigmatism, the bowtie-
- shaped color pattern extends across the
- cornea. This type of corneal astigmatism is
- likely to be responsible for a corresponding
- amount of refractive astigmatism.
20 Regular Central Astigmatism
Also known as Axial Astigmatism
21 Interpreting the Maps
- Regular Astigmatism
- In central astigmatism, most of the
- bowtie-shaped color pattern occurs within
- the pupillary region. This type of corneal
- astigmatism can be underestimated by
- traditional keratometry readings and may
- not match the refractive astigmatism.
22 Interpreting the Maps
- Irregular Astigmatism
- Irregular astigmatism can be
- expressed in three forms
- (1) Asymmetric
- (2) Non-Orthogonal
- (3) Unspecified
23 Asymmetric Irregular Astigmatism
24 Interpreting the Maps
- Irregular Astigmatism
- In asymmetric irregular astigmatism,
- the two ends of the bowtie-shaped color
- pattern are of a different size and color.
- This can be clinically significant if there
- is more than a one diopter difference in
- the amount of astigmatism on each end
- of the bowtie.
25 Keratoconus
26 Pellucid Marginal Degeneration
27 Non-Orthogonal Irregular Astigmatism
28 Interpreting the Maps
- Irregular Astigmatism
- In non-orthogonal irregular astigmatism,
- the bowtie-shaped color pattern is bent
- instead of being straight.
- Corneal dystrophies and other corneal
- diseases can produce non-orthogonal
- astigmatism.
29 Interpreting the Maps
- Unspecified Irregular Astigmatism
- In unspecified astigmatism, there may be
- no bowtie-shaped color pattern displayed
- by the corneal topographer. The corneal
- irregularities may have a random distribution
- with no specific pattern. With this clinical
- presentation, focal changes of more than
- 1.5 diopters could be clinically significant.
30 Unspecified Irregular
Astigmatism
31 Interpreting the Maps
- Corneal Shape Anomalies
- (1) Abnormal Shape Symmetry
- (2) Areas of Significant Relative Steepness
- (3) Areas of Significant Relative Flattening
- (4) Abnormal Corneal Eccentricity
32 Interpreting the Maps
- Corneal Shape Symmetry
- The shape of the superior cornea should be
- compared to the shape of the inferior cornea,
- just as the shape of the nasal cornea should
- be compared to the temporal cornea.
- Any asymmetry above 1.5 diopters
- could be clinically significant.
33 Abnormal Shape Symmetry
34 Specular Microscopy Primer
- The clinical application of specular
- endothelial microscopy is to enable the
- status of the corneal endothelium
- to be obtained by visual observation.
- The test is indicated in the diagnosis
- and treatment of any eye disease, eye
- injury, or ocular condition that can result
- in corneal endothelial cell damage.
35 Modern Specular Microscope
36 Clinical Indications
- Many eye diseases affect the corneal
- endothelium. Significant alterations
- in endothelial function (endotheliopathy)
- can result in any or all of the following
- (1) Blurred Vision
- (2) Fluctuating Vision
- (3) Permanent Visual Impairment
37 Risk Factors for Corneal
Endotheliopathy
- Advancing Age
- Corneal Disease
- Ocular Disease
- Systemic Disease
- Ocular Surgery
- Ocular Injury
- Contact Lens Wear
38 Specular Microscopy
- Endothelial cell damage is represented by the
following - (1) Reductions in endothelial cell density
- (2) Morphological changes such as
- polymegathism and pleomorphism
- (3) The appearance, enlargement, or
- coalescence of corneal guttata
39 Specular Microscopy
Photomicrographs
40Specular Endothelial Microscopy Corneal
Endothelial Dystrophies
- Corneal guttata consists of abnormal
- outgrowths of Descemets membrane that
- squeeze between the endothelial cells.
- They are apparently formed as endothelial
- cell density decreases and the barrier
- function of the endothelium is compromised.
- Guttata appear as dark spots in the normal
- hexagonal mosaic pattern of the cells.
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42Specular Endothelial Microscopy
Corneal Guttata
43Specular Endothelial Microscopy Corneal
Endothelial Dystrophies
- Guttata represent a generalized endothelial
- dysfunction. If they are present in large
- numbers, guttata may lead to stromal
- edema and an accompanying decrease in
- vision. Visual acuity can also be affected if
- the guttata are concentrated heavily in the
- axial region of the cornea.
44 Corneal Physiology
- Deturgescence is the state of relative
- dehydration maintained by the normal
- intact cornea which enables it to remain
- transparent. The endothelium is the layer
- of the cornea responsible for this function.
- The functional limit for maintaining
- deturgescence is a cell count of 7001000.
45 B-Scan Ophthalmic Ultrasound Clinical
Applications
- Ultrasound is the term for sound waves
- projected at a very high frequency.
- (over 20,00 kHz)
- B-Scan Ophthalmic Ultrasound uses
- transducer scanning and electronic
- processing to image the internal
- structures of the eye and orbit.
46 Modern Transducer
47transducer scanning and electronic prossesing,
images the internal structures of the body.
When used in this manner, the examination
technique is known as diagnostic ultrasound.
B-Scan Ophthalmic Ultrasound is used to image
the internal structures of the eye and orbit.
Clinical Indications
- B-Scan ophthalmic ultrasound is used
- when clouding of the ocular tissues
- prevents proper visualization and
- examination of the structures of the eye.
- B-Scan ophthalmic ultrasound is used to
- determine the composition and contours
- of ocular and orbital structures.
48 Clinical Indications
- Patients with dense cataracts or corneal
- opacities that prevent good visualization
- of the retina.
- Patients with vitreous floaters, deposits,
- hemorrhages, and/or degenerations.
- Patients with signs and/or symptoms of
- retinal detachment.
49Interpreting the B-Scans
Dense Cataract
Retina Grossly Normal
50Interpreting the B-Scans
Asteroid Hyalosis
Asteroid Hyalosis
51Interpreting the B-Scans
Retinal Detachment
Retinal Detachment
52VF defect from retinal detachment
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54 Case Report 1
- A 62-year old Black woman presented for an
- eye examination with a chief complaint of
- elevated intraocular pressure. The patient
- was referred by another optometrist that
- same day by telephone. The referring
- optometrist had measured the elevated
- intraocular pressures and was requesting
- an emergency appointment with me.
55 Medical Eye Examination Service
Components
- IOP OD 36 OS 24 Tonopen
- _at_ 415
pm - Biomicroscopy All structures normal
- Ophthalmoscopy
- (1) Asymmetric cupping
- (2) Vertical elongation of right optic cup
- OD 0.4 h OS 0.2 h
- 0.6 v 0.2
v
56 Case 1 Open Angle Glaucoma
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58Medical Eye Examination
Clinical Diagnosis
- Determining a clinical diagnosis of
- glaucoma only leads to other questions.
- Question 1 What type of glaucoma?
- Question 2 How bad is the glaucoma?
- Question 3 How are you going to treat?
- The answers require a Physical Diagnosis.
59 Initiation of Diagnostic
Treatment Program
- Refraction OD 1.50 sphere 20/25
- OS 1.50 sphere
20/20 - Scanning Laser Polarimetry
- (1) Severe fallout of retinal nerve fiber
- layer Right Eye
- (2) Abnormal inter-eye symmetry
- NFI 62 on the Right Eye
- NFI 27 on the Left Eye
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61 Initiation of Diagnostic
Treatment Program
- Visual Field Examination
- (1) Moderate reduction in retinal sensitivity
- Right Eye Mean Deviation 7.58 DB
- (2) Mild reduction in retinal sensitivity
- Left Eye Mean Deviation 3.54 DB
- (3) Paracentral scotomas Right Eye
- (4) Poor reliability Both Eyes
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64 Initiation ofDiagnosis Treatment
Program
- High Resolution Biomicroscopy
- (1) Normal iris configuration Both Eyes
-
- (2) Open angles Both Eyes
- (3) Thin corneal thickness Both Eyes
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67 Initiation of Diagnostic
Treatment Program
- Specular Endothelial Microscopy
- (1) Mild corneal endothelial dystrophy
- Both Eyes
- (2) No severe morphological changes to
- the endothelial cells or corneal edema
- from long-term exposure to elevated
- intraocular pressure.
-
68 Iniatition of Diagnostic
Treatment Program
Specular Photomicrographs
69 Initiation of Diagnostic
Treatment Program
- Serial Tonometry
- Medical treatment of acute elevation
- of intraocular pressure.
- OD OS Treatment
- 36 24 _at_ 415 pm 1 gt Timolol 0.5 _at_ 420
pm - 27 15 _at_ 558 pm 250 mg Diamox _at_ 440
pm - 19 15 _at_ 730 am 1 gt Pilocarpine 1 _at_ 440
pm - Next Day
70 Initiation of Diagnostic
Treatment Program
- Physical Diagnosis Open-Angle Glaucoma
- Category of Glaucomatous Damage
- Right Eye Moderate
- Left Eye Mild
- Initial Target Pressure
- Right Eye 20 mmHg
- Left Eye 16 mmHg
- Initial Treatment Timolol and Pilocarpine
71 Case Report 1Coding for 1st Visit (Blue
Cross Ins)
- CPT code 92004 126.28 Medical
Eye Examination - CPT code 92135 (RT) 44.50 Retinal
Scanning Laser - CPT code 92135 ( LT) 44.50
Retinal Scanning Laser - CPT code 92083 76.87 Visual
Field Examination - CPT code 92286 138.26
Specular Microscopy - CPT code 92100 86.16
Serial Tonometry - CPT code 76513 (RT) 97.87 High Resolution
Biomicroscopy - CPT code 76513 (LT) 97.87 High Resolution
Biomicroscopy - Total for initial visit 712.31
72 Case Report 2
- A 62-year old White man returned to the office
for an - eye examination with a chief complaint of blurred
vision. - The History of Present Illness described a
subjective - decrease in vision over the past one month. The
quality - of the blurred vision was described as, like
seeing a film - over my eyes. The blurred vision was present in
both - eyes, moderate in severity, and seemed to be
getting - worse. Other than re-wetting eyedrops for
contact lens - wear, the patient reported using no modifiers for
his - condition. Previous eye exam was 15 months
earlier.
73 Patient History Case 2
- MEDICATIONS Insulin, Glucophage, Zestril,
Plavix, and Lipitor - PAST MEDICAL HISTORY Diabetes, hypertension,
hyperlipidemia, sleep apnea - PAST OCULAR HISTORY Significant for full-time
soft contact lens wear for 25 years and mild
nonproliferative diabetic retinopathy for 2 years - REVIEW OF SYSTEMS Significant for chronic
numbness of the feet
74 Medical Eye Examination Service Components
- Acuity w/CLs OD 20/20 OS 20/50
- IOP Non-Contact Tonometer _at_ 945 am
- OD - 11 OS - 16
-
- Biomicroscopy All structures normal
- Ophthalmoscopy
- (1) Retinal hemorrhage Left Eye
- (2) Exudative maculopathy Left Eye
- (3) Peripapillary atrophy Both Eyes
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77Medical Eye Examination Clinical Diagnosis
- Determining a clinical diagnosis of glaucoma
- suspect only leads to other questions.
- Question 1 Does the patient have glaucoma?
- Question 2 How bad is the macular edema
- in the left eye?
- Question 3 Is there anything else wrong
- with the patient?
78 Initiation of Diagnostic Treatment
Program
- Determination of Differential Diagnoses
- These diseases, which share symptoms or
- signs with the clinical diagnosis, must be
- identified and excluded
- for the diagnostic process to continue.
- Differential Diagnosis 1 Glaucoma
- Differential Diagnosis 2 Visual Field
Defect - Differential Diagnosis 3 Corneal
Disorder
79 Initiation of Diagnostic
Treatment Program
- Refraction
- O.D. 5.50 0.50 x 090 20/20
- O.S. 3.75 0.50 x 090 20/25
- Contact Lenses
- (1) Proclear Multifocals by Cooper Vision
- (2) Modified monovision for past 5 years
- (3) Daily wear 1 month discard cycle
80 Initiation of Diagnostic Treatment
Program
- Fundus Photography
- (1) Comparative retinal photographs from
- 15 months earlier reveal a worsening
- of the exudative maculopathy Left Eye
- (2) Flame hemorrhage in the left eye is in
- the peripapillary region, not on the
- optic disc therefore, hemorrhage is
- secondary to diabetic retinopathy.
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83 Initiaton ofDiagnostic Treatment
Program
- Visual Field Examination
- No clinically significant visual field
- defects exist - (poor test reliability)
- Scanning Laser Polarimetry
- 1. Moderate fallout of retinal nerve fiber
- layer Both Eyes - (atypical scans)
- Specular Endothelial Microscopy
- 1. Severe corneal dystrophy Both Eyes
- 2. Reduced cell density Both Eyes
-
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87 Initiation of Diagnostic
Treatment Program
Specular Photomicrographs
88 Initiation of Diagnostic Treatment
Program
- Physical Diagnosis Corneal Dystrophy
- Secondary Diagnosis Mild Macular Edema
- Secondary Diagnosis Glaucoma Suspect
- Initial Treatment (1) Hypertonic Solution
- (2) Discontinue CL
Wear
89 Case Report 2 Coding for 1st
Visit (United Health Ins)
- CPT code 92014 95.09 Medical Eye
Examination - CPT code 92250 75.76 Fundus
Photography - CPT code 92083 76.87 Visual Field
Examination - CPT code 92286 138.26 Specular
Microscopy - Total for initial visit in this series 385.98
90 Continuation of Diagnostic
Treatment Program
- Retinal Laser Scan
- Normal macular thickness Both Eyes
- Gonioscopy
- (1) Normal angle structures Both Eyes
- (2) Normal iris configuration Both Eyes
- Corneal Pachymetry
- Normal corneal thickness Both Eyes
2nd visit 14 days later
91Right Eye
Left Eye
92 Continuation of Diagnosis
Treatment Program
- Primary Physical Diagnosis
- Mild nonproliferative diabetic retinopathy
- Both Eyes (Level 2 Low Risk)
- Secondary Physical Diagnoses
- (1) Mild diabetic macular edema Left Eye
- (2) Corneal endothelial dystrophy Both Eyes
- Excluded Differential Diagnoses
- (1) Glaucoma suspect
- (2) Visual field defect
93 Case Report 2 Coding for 2nd Visit
(United Health Ins)
- CPT code 92012 64.46 Medical
Eye Exam - CPT code 92020 25.92
Gonioscopy - CPT code 92135 (RT) 44.50 Retinal Scanning
Laser - CPT code 92135 (LT) 44.50 Retinal
Scanning Laser - CPT code 76514 12.58 Corneal
Pachymetry
Total fees for two visits 577.94
94 Case Report 3
- A 43-year old Black woman presented for an eye
- examination with a chief complaint of blurred
vision. - The History of Present Illness described a
subjective - decrease in vision over the past few months. The
- patient also complained of the associated
symptoms - of burning, itching, and watery eyes. The
primary - symptom of decreased vision was present in each
- eye, moderate in severity, and seemed to be
getting - worse over time. Other than over the counter
- reading glasses, the patient reported that she
used - no eyedrops or other modifiers for her condition.
95 Patient History
- MEDICATIONS Insulin, gabapentin
- PAST MEDICAL HISTORY Diabetes,
- epilepsy
- PAST SURGICAL HISTORY Hysterectomy
- REVIEW of SYSTEMS Significant for
- constipation
96 Patient History
- PAST OCULAR HISTORY
- Significant for episodes of blurred vision,
- double vision, dry eyes, mucus discharge,
- red eyes, burning eyes, itchy eyes, gritty
- sensations, problems with glare, problems
- with light sensitivity, and chronic eye
- infections.
97Medical Eye Examination Service Components
- Unaided Visual Acuity
- OD 20/60 OS 20/60
- Biomicroscopy
- Moderately-severe keratoconjunctivitis
- Both Eyes
- IOP OD 23 OS 20
- Goldmann Tonometry _at_ 1000 am
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99 Case Report 4 Glaucoma Suspect
Medical Eye Examination
- Patient History
- Visual Acuity
- Intraocular Pressure
- Adnexal Examination
- Biomicroscopy
- Ophthalmoscopy
- Clinical Diagnosis
100 Medical Eye Examination Service
Components
- Ophthalmoscopy
- (1) Microaneurysms Both Eyes
- (2) Dot hemorrhages Both Eyes
- (3) Cotton wool infarcts Left Eye
- (4) Intraretinal microvascular
- abnormalities Both Eyes
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103Medical Eye Examination Clinical Diagnoses
- Primary Diagnosis Diabetic Retinopathy
- Secondary Diagnoses Glaucoma Suspect
- Dry Eye
Syndrome - Determining multiple clinical diagnoses
- only leads to other questions.
- Question 1 How bad is the retinopathy?
- Question 2 Does this patient have glaucoma?
- Question 3 What type of dry eye is present?
104 Initiation of Diagnostic
Treatment Program
- Refraction
- O.D. 1.25 20/20
- O.S. 1.25 20/20
- External Ocular Photography
- Medically necessary to document the
- progress or deterioration of the keratitis
- and its response to treatment.
105 Initiation of Diagnostic Treatment
Program
- Scanning Laser Polarimetry
- (1) Normal TSNIT curve analysis Both Eyes
- (2) Normal NFI values O.D. 23 O.S. 24
- (3) Normal inter-eye symmetry
- Corneal Pachymetry
- Thick corneas Both Eyes
- O.D. 610 um O.S. 590 um
This Patient Does Not Have Glaucoma
106 Tear Film Analyzer
107 Initiation of Diagnostic Treatment
Program
- Tear Film Chemistry Analysis
- (1) Lactofferin levels were low, suggesting
- an aqueous deficiency dry eye syndrome
- OD 2.13 mg/mL OS 0.78 mg/mL
- (2) Immunoglobulin E levels were normal,
- suggesting the absence of active ocular
- allergic response.
- OD 7 ng/mL OS 65 ng/mL
108 Initiation of Diagnosis
Treatment Program
- Primary Physical Diagnosis
- Moderate Nonproliferative Diabetic Retinopathy
- Both Eyes (Level 3 Low Risk)
- Secondary Physical Diagnosis
- Dry Eye Syndrome
- (Moderately-severe aqueous deficiency)
- Excluded Differential Diagnosis
- Glaucoma Suspect
109 Initiation of Diagnostic
Treatment Program
- Bandage Contact Lenses
- Some soft contact lenses can be used
- as corneal bandages in the treatment
- of corneal pathology such as keratitis.
- Closure of the Lacrimal Punctum
- Punctal occlusion with collagen plugs
- can be performed to diagnose and
- treat dry eye syndrome.
110 Case Report 3 Coding for 1st
Visit (Medicare Insurance)
- CPT code 92004 126.28
Medical Eye Exam - CPT code 92135 (50) 89.00
Retinal Laser Scan - CPT code 92285 45.98
External Photography - CPT code 82350 (RT) 18.08 Tear
Film Chemistry - CPT code 82350 (LT) 18.08 Tear
Film Chemistry - CPT code 92070 (RT) 66.82 Bandage
Contact Lens - CPT code 92070 (LT) 66.82
Bandage Contact Lens - CPT code 68761 (E2) 137.29
Collagen Plug Implant - CPT code 68761 (E4, 51) 68.64 Collagen
Plug Implant - CPT code 76514 (TC) 3.22
Corneal Pachymetry - CPT code 76514 (26) 9.36
Corneal Pachymetry
111 Case Report 3Coding for 2nd Visit 3 days
- CPT code 99213 (24) - 61.55
- Purpose Medical eye examination to remove
- the bandage contact lenses and re-evaluate the
- status of the keratitis (ICD-9 code 370.33).
- Coding This exam is performed during the
- 10-day global period of the punctal occlusion
- (CPT code 68761) that was performed 3 days
- earlier for dry eye syndrome (ICD-9 code
375.15) - and therefore must be coded with the -24
modifier.
112 Continuation of Diagnostic Treatment
Program
- Specular Endothelial Microscopy
- Normal corneal endothelium Both Eyes
- Closure of the Lacrimal Punctum
- Punctal occlusion with silicone plugs
- may be used to treat dry eye syndrome.
113 Case Report 3 Coding for 3rd Visit 2
weeks
- CPT code 92012 (25) 64.46
Medical Eye Exam - CPT code 92286 138.26
Specular Microscopy - CPT code 68761 (E2) 137.29 Silicone
Plug Implant - CPT code 68761 (E4, 51) 68.64 Silicone
Plug Implant - Total for 3 visits 1,119.77