Clinical Experience
with the Tracey VFA
in Brazil
Renato Ambrósio Jr.
Universidade de São Paulo
Oftalmologia
Instituto
Benjamin Constant
Rio de Janeiro
Why should I buy a
wavefront analyzer?
Goals of the Preop exam in
refractive surgery
Screening refractive candidates
 Patient education
 Surgical Planning

R.Ambrósio Jr, M.D.
Screening refractive candidates
Complete eye exam
 Complementary exams
 Interview with the patient

R.Ambrósio Jr, M.D.
Preop exam in refractive surgery
Which exams should we do?
R.Ambrósio Jr, M.D.
UW Refractive Clinic Study

0.9% of the candidates had keratoconus
or pellucid marginal degeneration
R.Ambrósio Jr, M.D.
R.Ambrósio Jr, M.D.
CT View – Scales for
Corneal Topography
R.Ambrósio Jr, M.D.
KERATOMETRY
CORNEAL TOPOGRAPHY
REFRACTION
WAVEFRONT
R.Ambrósio Jr, M.D.
Advantages of Tracey-VFA for
screening refractive candidates
Accurate Refraction ~ 0.01 D (vs 0.25D)
 Manifest and Cycloplegia comparison
 Identification of high risk cases for night
vision problems after conventional
ablations (HOA and Total Aberrations)
 Integrated analysis with Corneal
Topography (CTView V.5 software)

R.Ambrósio Jr, M.D.
Screening refractive candidates with the
Tracey VFA – Bad candidate (BSCVA 20/15-2)
PSF Simulation for Patient education
Bad candidate (BSCVA 20/15-2)
All Aberrations
Only HOA
Screening refractive candidates with
the Tracey VFA
Instituto de Olhos Renato Ambrósio
Rio de Janeiro
PSF Simulation for Patient education
All Aberrations
Only HOA
Qualidade da Visão
R.Ambrósio Jr, M.D.
Integrated Analysis with the CT View
WF – Topo = Intraocular Optics
Clinical Applications: Monocular
Diplopia – Poor CL Fit after PKP
of causing
Scalesdiplopia
Contact LensImportance
Migrate Inferiorly
Aplicações do Wavefront
Entendendo as queixas do paciente
Effect of the Scan Size
Effect of the Scan Size
Irregular eyes measured with Tracey
Instituto de Olhos Renato Ambrósio
Rio de Janeiro
Irregular eyes measured with Tracey
Instituto de Olhos Renato Ambrósio
Rio de Janeiro
Validação de Exames que não utilizam
Iluminação Inframermelha
Adjusted Auto Topography Pupil
measurement (mm)
COLVARD LOW LIGHT vs
ADJUSTED AUTO TOPOGRAPHY
8
7
6
5
4
3
2
2
3
4
5
6
7
Colvard Low Light Pupil Size (m m )
r= 0.68
8
Pupil Measurements with the Tracey VFA
Instituto de Olhos
Renato Ambrósio
Thank you!
[email protected]