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Intraocular foreign body and contact lens
MAY 23, 2023
Complaining of eye pain and a foreign body sensation, a patient presented themselves after two days of wearing colored contact lens. A remnant of a contact lens was found in the eye and was removed with no complications.
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0
1
Magnifiers
DEC 16, 2022
Handheld and stand magnifiers.
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0
21
Surgical microscope
DEC 16, 2022
Difficulty of “getting comfortable” at the operating microscope. Beware that the distance from the bottom of the operating table to the microscope eyepieces may exceed the distance from the top of the thighs to the surgeon’s eyes. To make up for the missing height, a shorter…
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0
26
Multifocal interocular lens
DEC 16, 2022
Multifocal IOLs. A, Hoffer split bifocal IOL (left) and an early photograph of a lens implanted in a patient (right). B, Three-zone multifocal design. C, Diffractive multifocal IOL; the cross-section of the central portion is magnified. (The depth of the grooves is exaggerat…
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0
36
Manual keratometer
DEC 16, 2022
Manual keratometer.
Image
0
118
Pantoscopic tilt
DEC 16, 2022
In order to optimize image quality for both straight-ahead viewing and downgaze (as for reading), eyeglass frames typically rotate the plane of the lenses downward, a correction known as pantoscopic tilt. Values of about 7° are typical.
Image
0
305
Prevalence of and high myopia
DEC 16, 2022
Line graph showing the historial and predicted prevalence of myopia and high myopia for each decade from 2000 through 2050.
Image
0
10
Refraction by a single curved surface
DEC 16, 2022
Refraction by a single curved surface. The incident ray emanating from an object (o) located at a given distance (u) undergoes refraction by a single curved surface (eg, a simple plus lens of negligible thickness). The refracted ray is directed toward an image point (i), whi…
Image
0
4
"Practice Eye"
DEC 16, 2022
Commercial model eye for retinoscopy practice.
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0
6
Occluding the left side of the phoropter
DEC 16, 2022
Occluding the left side of the phoropter:
A,
Opaque occluder (
arrow
).
B, +1.50 D “R” accessory lens (
arrow
). Notice the settings of the accessory wheel for the right eye, at the top left of the photos.
C, Accessory wheel.
Image
0
7
Cylindrical lenses
DEC 16, 2022
Cylindrical lenses, with curvature in only 1 direction.
A,
Convex (plus cylinder) and concave (minus cylinder) glass lenses.
B,
Refraction through a convex cylinder.
Image
0
4
Vergence of an object
DEC 16, 2022
Diagram of the vergence of an object at 50 cm and with a +4.00 D lens, compared to a +3.00 D lens combination (+4.00 D and −1.00 D).
Image
0
2
Flap Striae after Femto-LASIK LASER
AUG 08, 2022
Flap striae after femto-LASIK in a 30-year-old female diagnosed 7 months postoperatively after otherwise uneventful procedure in her left eye.
Image
0
39
Punctate epithelial erosions
JAN 25, 2022
Slit-lamp photograph, showing punctate epithelial erosions. Inferior punctate fluorescein staining is noted in this image from a patient with moderately dry eyes.
Image
0
31
Post-LASIK striae
JAN 25, 2022
Post-LASIK striae. A, Retroillumination of multiple horizontal parallel macrostriae in the visual axis from mild flap dislocation. B, Diffuse illumination of visually insignificant microstriae in the visual axis after LASIK. C, Numerous randomly directed microstriae on fluor…
Image
0
15
Single and multizone keratectomies
JAN 25, 2022
Diagrammatic comparison of single and multizone keratectomies.
A,
Depth of ablation required to correct 12.00 D of myopia in a single pass.
B,
Depiction of how the use of multiple zones reduces the ablation depth required.
Image
0
4
Schachar theory
JAN 25, 2022
The Schachar theory proposes that the increase in equatorial zonular tension causes a decrease in peripheral lens volume and, thus, an increase in central lens volume and central lens curvature.
Image
0
2
Helmholtz theory of accommodation
JAN 25, 2022
Schematic representation of the Helmholtz theory of accommodation, in which contraction of the ciliary muscle during accommodation (bottom) leads to relaxation of the zonular fibers. The reduced zonular tension allows the elastic capsule of the lens to contract, causing an i…
Image
0
224
Retained foreign bodies in LASIK flap interface
JAN 24, 2022
Eleven years after having LASIK uneventfully performed on both eyes, this 37-year-old female had a blunt trauma in her left eye. Many foreign bodies and epithilial ingrowth can be seen at the lower half of her cornea between the flap and residual stroma.
Image
0
7
Epithelial sloughing during LASIK
AUG 04, 2021
A large area of epithelial slough is noted within the flap margin inferiorly.
Image
0
8
Astigmatic keratotomy
AUG 03, 2021
An infiltrate in an astigmatic keratotomy incision.
Image
0
1
Late diffuse lamellar keratitis
AUG 03, 2021
Photo of "shifting sands" inflammatory reaction in an interface after LASIK.
Image
0
10
Corneal "happy face" shape
AUG 03, 2021
Corneal shape analysis “happy face”.
Image
0
1
Sands of the Sahara syndrome
AUG 03, 2021
Sands of the Sahara syndrome—diffuse lamellar keratitis. Note the underlying stromal folds indicating progression to Stage III/early Stage IV.
Image
0
164
LASIK flap striae
AUG 03, 2021
Flap slip with “thumbprint” sign. These macrostriae, due to gross flap misalignment, resemble a thumbprint.
Image
0
27
Ectasia after LASIK
AUG 03, 2021
Slit-lamp examination of the left cornea in patient showing central ectasia of 229 µm.
Image
0
4
Radial keratotomy surgery
AUG 03, 2021
Cornea that has undergone radial keratotomy surgery, with 8 radial incisions placed evenly around the cornea, to correct myopia.
Image
0
15
Limbal relaxing incision
AUG 03, 2021
Limbal relaxing incision (LRI) for astigmatism.
Image
0
4
Microbial keratitis
AUG 03, 2021
Postoperative PRK infection, day 5, in a physician who placed his own contact lens and possibly old contact lens solution in his eye after a BSCL was displaced. Cultures were positive for Staphylococcus epidermitis. He subsequently underwent phototherapeutic keratectomy, and…
Image
0
11
Monovision
JUN 09, 2021
Relative to refractive surgery, the term “monovision” denotes targeting the refraction of one eye for distance and one eye for near vision. This technique may be offered particularly to patients with presbyopia. Although it does not give the sharpness of vision possible when…
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0
20
Snellen chart
JUN 09, 2021
SLIDE 10 Visual acuity is the main measure of eyesight. It is essentially a measure of the eye’s resolution. Snellen acuity, the most common measurement scale, is familiar as the “big E” chart.
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0
20
Radial keratotomy
JUN 09, 2021
Radial keratotomy (RK) was developed in the 1970s and for a time was thought to be the best refractive technique. Although versions of RK still have use today, in general safer and more stable refractive procedures have replaced it.
Image
0
3
Keratoconus
JUN 09, 2021
Aside from astigmatism, other disorders affecting the shape or clarity of the cornea will affect visual acuity. One of these, keratoconus, is a noninflammatory progressive ectasia of the cornea resulting in progressive thinning and steepening of the corneal surface.
Image
0
1
Astigmatism
JUN 09, 2021
Astigmatism is the state in which the refractive power is not uniform in all meridians of the cornea, resulting in light rays focusing at different points.
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0
3
Myopia
JUN 09, 2021
In myopia (nearsightedness) the image is focused in front of the retina instead of on it.
Image
0
1
Photoablative procedure
JUN 09, 2021
Photoablative procedures include all procedures using laser light to ablate, or reshape, the cornea, thereby changing the power and refraction to a desired state.
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0
10
Phakic IOL
JUN 09, 2021
A phakic IOL is an artificial lens that is surgically implanted in the eye while leaving the eye’s natural lens in place.
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0
4
Hyperopia
JUN 09, 2021
In hyperopia (farsightedness), the image is focused behind the retina.
Image
0
2
Acuity corneal disorder: corneal scarring
JUN 09, 2021
Any corneal opacity resulting from trauma, infection, or inflammation may limit visual acuity even after refractive surgery. A form of laser surgery, phototherapeutic keratectomy, may decrease corneal scarring in some instances.
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0
5
Human eye
JUN 09, 2021
Light rays enter the eye through the clear cornea, pupil, and lens.
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21
Cataract
JUN 09, 2021
A cataract is an opacity of the crystalline lens. Cataracts have many causes but most commonly are a result of aging.
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0
2
Blepharitis
JUN 09, 2021
The two most common tear film problems result in dry eye and blepharitis.
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0
1
Arcuate keratotomy
JUN 09, 2021
Arcuate keratotomy (AK) uses the same principles as RK (except incisions are made tangentially)
Image
0
23
Wavefront aberrations
JAN 15, 2021
Pictorial explanation of wavefront aberrations by means of water waves. A, A perfect, regular wavefront is shown. B, An irregular wavefront is shown that became distorted by a floating twig.
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0
4
Wavefront
JAN 15, 2021
A wavefront is an imaginary construct that can best be understood in the example of water waves. Note that wavefronts are perpendicular to the ray direction.
Image
0
2
Pathological myopia with tessellated
NOV 19, 2020
Tiger skin appearance of retina in case of pathological myopia.
Image
0
18
KAMRA inlay
SEP 21, 2020
KAMRA Inlay. a. Slit-lamp image. b. Scheimpflug Pentacam image and densitometry after implantation. c. Pachymetry after implantation.
Image
0
5
LASIK Techniques
SEP 03, 2020
A comparison of presbyopia-correcting LASIK Techniques.
Image
0
2
Conductive keratoplasty
SEP 03, 2020
Conductive keratoplasty
Image
0
18
Intrastromal incision posttreatment
SEP 03, 2020
INTRACOR: Intrastromal incision posttreatment.
Image
0
2
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