The keratometer is an instrument used to measure the curvature of the cornea, which provides information such as the radii of curvature, astigmatism level and direction, and presence of distortions. Keratometry is important for contact lens fitting, monitoring keratoconus, and determining intraocular lens power for cataract surgery. There are two main types - single-position keratometers measure two meridians simultaneously while double-position keratometers measure one meridian at a time. The procedure involves aligning and focusing the instrument before taking radius and astigmatism measurements from the scales.
Detailed instumentaion and use of manual Lensometer and just a outline of automated lensometer.
I have used the picture of manual lensometer with out the parts describtion because i have explained orally by showing the picture..
Hope u all like it and may help you in learning better. :)
Detailed instumentaion and use of manual Lensometer and just a outline of automated lensometer.
I have used the picture of manual lensometer with out the parts describtion because i have explained orally by showing the picture..
Hope u all like it and may help you in learning better. :)
Ophthalmic Prisms: Prismatic Effects and DecentrationRabindraAdhikary
Ophthalmic Prisms: Prismatic Effects and Decentration
here we discuss about the ophthalmic prisms, the prismatic effects as caused by the decentration( moving the optical center away from the visual axis)
Keratometer is an ophthalmic instruments and has a very important role in optometry field specially for IOL power calculation, Contact lens fitting, to rule out corneal pathology and its progression ie Keratoconus, PMCD.
Ophthalmic Prisms: Prismatic Effects and DecentrationRabindraAdhikary
Ophthalmic Prisms: Prismatic Effects and Decentration
here we discuss about the ophthalmic prisms, the prismatic effects as caused by the decentration( moving the optical center away from the visual axis)
Keratometer is an ophthalmic instruments and has a very important role in optometry field specially for IOL power calculation, Contact lens fitting, to rule out corneal pathology and its progression ie Keratoconus, PMCD.
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New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
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Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
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Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
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3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
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2. The
keratometer is an instrument that is
used to measure the front surface (approx
2 - 4 mm radius) curvature of the cornea.
Keratometry
3. Information that provides are:
The
radii of curvature of the cornea.
The directions of the principal meridians
of the eye, determining whether the
astigmatism is with-the-rule or against-therule -- a key factor in contact lens fitting.
The
degree of corneal astigmatism.
The presence of any corneal distortion.
Keratometry
4. KERATOMETER
Keratometry is essential in the fitting of
contact lenses, evaluating and following
patients with keratoconus, and in the
determination of appropriate intraocular
lens implant power for patients undergoing
cataract surgery.
Keratometry
5. Optical Principles
Cornea
is a convex refracting surface
In order to find the refracting power of the
cornea, we need to reflect an object of a
known size at a known distance off the
corneal surface. Then determine the size
of the reflecting image with measuring
telescope and calculate the refractive
power of the cornea based on the
refractive index of n= 1.3375
Keratometry
6.
The keratometer usually shows the corneal curvature in
diopters of power or in millimeters and diopters.
If a millimeter scale is not given, it can be found
from tables or by using the surface power formula using
the refractive index 1.3375.
n-1
Surface power formula: D = .........
R
D = the dioptric power of the cornea
n = the refractive index of the keratometer used (1.3375)
R = the radius of curvature of the cornea in meters
Keratometry
9. Keratometer Mechanical
Adjustments and Parts
A. Focusing Knob
B. Rotating Grip for Locating
the Axis
C. Chin Rest
D. Locking Knob
E. Elevating Knob
EP. Eyepiece
G. Head Rest Adjusting Knob
H. Occluding Shield
HR. Head Rest
J. Chin Rest Adjusting Knob
K. Leveling Sight
M. Horizontal Measuring Drum
N. Vertical Measuring Drum
S. Axis Scale
Keratometry
10. Bausch & Lomb Keratometer
One
position keratometer: it measures two
meridians at the same time
It
contains two prisms
Keratometry
11. PROCEDURE
1)
Eyepiece Adjustment : turn the
eyepiece (EP) counterclockwise fully.
Place a white sheet of paper in front of the
telescope part. Turn the eye piece
clockwise until the specified target in the
instrument becomes in sharp focus.
Keratometry
12. 2)
Adjust the height of the instrument and
align the outer canthus of the patient with
the leveling sight sign (item K in Figure 2)
3)Occlude
the non-tested eye (with H).
Keratometry
13. 4)Ask
the patient to look at the center of
the instrument. If you are aligned, you can
see the circles in the eye. The patient can
see the picture of their eye in the
instrument.
Keratometry
14. 5)Adjust
the focusing knob( item A in Fig
2) such that you get a single image of the
central circle.(A,B in Fig 3)
6)
Align the side and upper circles with the
central circle by rotating the body of the
instrument(using item B in Fig 2) .(C in
Fig3)
Keratometry
15.
7) Use the horizontal alignment knob(M) to bring
the crosses on each other.(E in Fig 3)
8) Use the vertical alignment knob(N) to bring
the crosses on each other.
9) Read the values from the scales (M & N) and
the angle from (S).
Keratometry
18. Procedure
Follow steps 1-4 of the above instrument
5) Adjust the instrument to see a clear image of
the rectangle and staircase targets
Keratometry
19. 6)
Rotate the instrument to align the line in
rectangle with the line in the staircase
target.
7)
Turn the measuring knob until staircase
and rectangle just overlap.
8)
Read the values from the scales.
Keratometry