The document provides an overview of eye anatomy and development from embryology through childhood visual milestones. It describes the development of eye structures from the optic vesicle and lens placode in the embryo. Key structures of the adult eye are defined including the orbits, lids, anterior and posterior segments. The visual pathways and extraocular muscle innervation are also reviewed. Childhood visual development milestones from pupillary light reflex to coordinated eye movements and visual exploration are outlined.
Astigmatic lens used in ophthalmology and eyeRACHANA KAFLE
different types and classifications of astigmatic lens used
availability of astigmatic lens
uses of astigmatic lens
advantages and disadvantages of astigmatic lens
Astigmatic lens used in ophthalmology and eyeRACHANA KAFLE
different types and classifications of astigmatic lens used
availability of astigmatic lens
uses of astigmatic lens
advantages and disadvantages of astigmatic lens
• All structures are supplied by branches of
Internal Carotid Artery
• Except eyelids and conjunctiva which receives
blood supply from the branches of both
internal and external carotid artery
Central retinal artery
• First branch from the ophthalmic artery
• End arteries
• Divides into equal superior & inferior branches,
then another division (nasal & temporal)
The tear film constitutes Three layers :- An outermost lipid (oily) layer An aqueous (watery) layer that makes up 90% of the tear film volume; and A mucin layer that coats the corneal surface.
3. To form smooth optical surface on cornea. To keep the surface of cornea & conjunctiva moist It serve as lubricant It transfer oxygen Provide antibacterial action Wash debris out It provides a pathway for WBC in case of injury
4. Functions of lipid layer Retards evaporation of tear film Prevents the overflow of tears
5. Function of Aqueous Layer Flushes, buffers and lubricates the corneal surface Delivers oxygen and other nutrients to the corneal surface Wash out debris Delivers antibacterial enzymes and antibodies such as lysozyme.
6. Functions of Mucin Layer Spreads tears over corneal surface. Protects the cornea against foreign substances . Makes corneal surface smooth by filling in surface irregularities
• All structures are supplied by branches of
Internal Carotid Artery
• Except eyelids and conjunctiva which receives
blood supply from the branches of both
internal and external carotid artery
Central retinal artery
• First branch from the ophthalmic artery
• End arteries
• Divides into equal superior & inferior branches,
then another division (nasal & temporal)
The tear film constitutes Three layers :- An outermost lipid (oily) layer An aqueous (watery) layer that makes up 90% of the tear film volume; and A mucin layer that coats the corneal surface.
3. To form smooth optical surface on cornea. To keep the surface of cornea & conjunctiva moist It serve as lubricant It transfer oxygen Provide antibacterial action Wash debris out It provides a pathway for WBC in case of injury
4. Functions of lipid layer Retards evaporation of tear film Prevents the overflow of tears
5. Function of Aqueous Layer Flushes, buffers and lubricates the corneal surface Delivers oxygen and other nutrients to the corneal surface Wash out debris Delivers antibacterial enzymes and antibodies such as lysozyme.
6. Functions of Mucin Layer Spreads tears over corneal surface. Protects the cornea against foreign substances . Makes corneal surface smooth by filling in surface irregularities
anatomical consideration of development of eye from embryonic stage. gives insight into future anatomical and pharmacological basis of drug development in disorders of eye.
The eyeball is a spherical structure having 2.5 diameters. Structurally, the eyeball has three layers:- sclerotic layer (outer layer); choroid (middle layer) and retina (inner layer).
Outermost layer contains sclera and cornea
Middle layer contains choroid, ciliary body and iris.
Innermost layer consists of retina
The eyeball is a spherical structure having 2.5 diameters. Structurally, the eyeball has three layers:- sclerotic layer (outer layer); choroid (middle layer) and retina (inner layer).
Focuses an image by refracting, or bending the light rays using cornea and the lens. At the yellow spot of retina an inverted image is formed. Most of the refraction of light occurs in cornea due to its curved surface.
these slide are modified or upgraded from the slid belonging to this website.i had added some of the content.hope that it will be more helpful to you all.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
1. Anatomy and Embryology of the Eye
Julie D Barliana
Pediatri-Ophthalmology Division
Ophthalmology Department FMUI/RSCM
2. The Protective Structures of the Eye
O TheOrbit
o The Lids
o The Sclera
The Anterior Segment of the Eye
o The Cornea
o The Aqueous Humor
o The Iris
o The CrystallineLens and CiliaryMuscle
The Posterior Segment of the Eye
o The Retina
o The Vitreous Humor
The Visual System Pathways to the Brain
o The Optic Nerves and Optic Tracts
o The Lateral Geniculate Nucleus
o The Visual Cortex
3. Anatomy of the eye
Cornea
Iris
Ciliary body
Lens
vitreus body
Retina
Choroid
Optic nerve (NII)
4. Anatomy of the Eye
Anterior
chamber
(Camera Oculi
Anterior)
Posterior
Chamber (Camera Hyaloid Canal)
Oculi Posterior)
Badan Kaca
(vitreus body)
Central Vessel Retina
6. Eye Development
I. Eye Fields-Optic Vesicle
(Weeks 3-4)
II. Optic Cup, Lens Vesicle,
Choroid Fissure, Hyaloid
Artery (Weeks 5-6)
III. Cornea, Anterior Chamber,
Pupillary Membrane, Lens,
Retina (Weeks 7-8)
IV. Iris, Ciliary Body
(Weeks 9-15)
V. Eyelids (Weeks 8-10)
7. A cut through the embryo demonstrates the
relationship of the optic groove to this
ectoderm.
the neuroectoderm of the optic groove comes
into close contact with the surface ectoderm
in the area indicated
8. Optic Vesicle
(Weeks 3-4)
The line indicates the
location of the cut. The optic grooves
form the optic stalks Contact between the neural
and the optic ectoderm of the optic vesicle and
vesicles. the surface ectoderm results in
induction of the lens placode.
9. Cutting the embryo in the indicated plane
illustrates the lens placode and the adjacent
portion of the optic vesicle as it begins to
invaginate
10. Optic Cup, Lens Vesicle,
Choroid Fissure, Hyaloid Artery (Weeks 5-6)
The invaginating lens placode forms the lens
vesicle that pinches off the surface ectoderm.
Invagination of the optic vesicle forms the
bilayered optic cup that remains connected to
the forebrain via the optic stalk.
11. Contact between the The lens placode The lens vesicle eventually
surface ectoderm and invaginates, forming the becomes the lens and the two
the budding optic lens vesicle. layers of the optic cup become
vesicle induces the Concurrently, the optic the neural and pigmented layers
differentiation of a vesicle becomes the of the retina.
population of cells optic cup.
that will form the lens
placode.
12. This diagram represents
the cut shown by the
dotted line. The hyaloid
artery courses through
the choroid fissure.
The optic vesicle and the
optic stalk invaginate,
illustrates the lens vesicle
forming the choroid fissure
and the hyaloid artery.
inferiorly.
The arrows show the areas of
invagination.
13. Cornea, Anterior Chamber,
Pupillary Membrane,
Lens, Retina (Weeks 7-8)
The hyaloid vasculature surrounds the back of
the lens. Following separation of the lens
from the surface, the posterior lens fibers The anterior chamber of the eye
elongate to obliterate the lens cavity and the forms as a space develops between
cornea begins to differentiate the lens and its closely associated
iridopupillary membrane and the
cornea.
14. Cornea
The cornea consists of an
outer epithelial layer derived
from surface ectoderm and
inner layers derived from
neural crest cells.
15. Iris, Ciliary Body (Weeks 9-15)
The pupillary membrane should regress, but
may persist after birth, appearing as in the
diagram.
16. Retina
As the retina develops, the pigmented layer
becomes relatively thinner while the neural
portion thickens.
As the neural portion develops,
it differentiates into distinct
cell layers.
17. Iris, Ciliary Body (Weeks 9-15)
The iris forms from the outer rim of the optic
cup
Folding of these layers
results in formation of the
ciliary processes.
At the rim of the optic cup, the inner and outer layers
become closely associated.
18. Eyelids (Weeks 8-10)
By the end of the embryonic The eyelids fuse at the beginning of the
period, eyelids begin to form. second trimester and reopen at the beginning
of the third trimester.
20. Some Ocular Anomalies
Retinal detachment—between inner and outer
portions of the optic cup derivatives
•congenital—failure of fusion
•acquired—trauma
Defects in closure of optic (choroid) fissure
•retinal coloboma
•iridial coloboma
Aniridia — (rare) 1 in 75,000
21. Extraocular Muscles
Develop from somitomeres I-
IV (paraxial mesoderm cranial
to the occipital somites)
Innervated via CN III, IV, & VI
Coordinate movements between the two eyes
(usually conjugate, although some instances
of physiological vergence exist)
23. Oculomotor Nerve (CN III)
Somatic motor
Parasympathetic
(oculomotor nucleus):
(Edinger-Westphal nucleus):
Sup. rectus, Inf. rectus,
Ciliary m. &
Med. rectus, Inferior oblique
Constrictor pupillae m.
& Levator palpebrae superior
mm.
24. Trochlear Nerve (CN IV) Abducens Nerve (CN VI)
Somatic motor only Somatic motor only
(trochlear nucleus): (abducens nucleus):
•Superior oblique m. •Lateral rectus m.
30. Rods and Cones
• Cone cells see in bright light and rod cells see
in black and white and in dark light
31. Physiology of Vision
• Light energy enters the eye, and the cornea
and lens focus it onto the retina
• The light stimulates the rods and cones, two
types of cells found in retina
• The rods and cones send impulses to the optic
nerve, which carries them to the visual area of
the cortex
• The cortex interprets the image and you “see”
32.
33. • Nearsightedness occurs
when light is focused in
front of the retina
• Farsightedness occurs when
light is focused behind the
retina
• Concave lens, thicker at
edge than in the middle,
corrects nearsightedness
• Convex lens, thicker in
middle than at edge,
corrects farsightedness
34. Visual development
• In the early months of life
– the visual system is still developing
• In a premature infant:
– depending on the extent of prematurity
– the eyelids may not have fully separated; the iris
may not constrict or dilate
– retinal blood vessels may be immature
– visual system is not ready to function
35. At birth:
•the pupils are not yet able to dilate fully
•newborn has poor fixation ability
•limited orienting to single targets from birth to
3 months
36. By 3 months
• ocular movements are coordinated most of the time;
• attraction is to both black and white and coloured
(yellow and red) targets;
• the infant is capable of glancing at smaller targets
(as small as 2.5 cm, or about 1 in.);
• visual attention and visual searching begin;
• the infant begins to associate visual stimuli with an
event (e.g., the bottle and feeding)
37. By 5-6 months
• The infant is able to look at an object in his/her own
hands
• ocular movement, although still uncoordinated at
times, is smoother
• the infant is visually aware of the environment
("explores" visually), and can shift gaze from near to
far easily
• the infant can "study" objects visually at near point
and can converge the eyes to do so; can fixate at 1m
• eye-hand coordination