discussion about Aspheric lens, fitting, indication,advantage and Disadvantages with traditional aspheric lens,need of Asphericity,Aspheric Lens Design, identification, troubleshooting
discussion about Aspheric lens, fitting, indication,advantage and Disadvantages with traditional aspheric lens,need of Asphericity,Aspheric Lens Design, identification, troubleshooting
Presentation containing information about all types of absorptive lenses its manufacturing, uses, advantages and disadvantages and some information about lens coatings.
How to protect your eye?
With sunglasses? Mirror glasses? Tinted or polarized glasses?
What is right tint colour for you?
What are antireflection coat glasses?
Presentation containing information about all types of absorptive lenses its manufacturing, uses, advantages and disadvantages and some information about lens coatings.
How to protect your eye?
With sunglasses? Mirror glasses? Tinted or polarized glasses?
What is right tint colour for you?
What are antireflection coat glasses?
Product Presentaion - Safe-X
This is an extension to a popular brand marketed by our company. To make the presentation stand out from other players in the market, key features were explained with icons and some important information were provided to support the statements given.
This was for a product extension. Since there was many features, I have made the presentation in such a way so that customers can easily recall. Therefore icons were used to describe each feature.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
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.
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
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.
Unit 8 - Information and Communication Technology (Paper I).pdf
High index
1. MADE BY : SWATI PANARA
FROM : BHARTIMAIYA COLLEGE OF
OPTOMETRY
2nd YEAR 3rd SEMESTER
1
2. WHAT IS THE REFRACTIVE INDEX?
• The ratio of speed of monochromatic
light in vacuum to speed of light in
another medium is called refractive
index.
OR
The ratio of sin of angle of
incidence to sin of angle of refraction.
2
4. • In simple terms, index is a measurement of
how much light is bent by the lens material.
The higher the number, the more the light is
bent by the lens.
4
5. HI INDEX
The term “hi index” refers to the lenses
whose index of refraction is higher than
1.49 in plastics and more than 1.523 in
glass.
5
6. • Normal index – 1.48 to 1.53.
• Mid index – 1.54 to 1.63.
• High index – 1.64 to 1.73.
• Very high index – 1.74 to above.
6
7. • For example, a -7.00D lens ground on a 1.70
index material will be approximately 50
percent thinner than a -7.00D lens ground on
a 1.50 index material if all parameters are
equal.
7
8. • Hi index glasses are made of
lanthanum or titanium rather than
barium as it gives similar optical
properties and also weight less.
• Some plastic lenses are made from
polyurethane.
8
9. • There are several plastic materials now
available in high index lenses, with index ratios
between 1.53 and 1.71.
• High index glass lenses are also available,
with a index of 1.90.
9
10. • Lenses of index = 1.5, 1.6, 1.7, 1.8 and 1.9 are
used for single-vision, solid bifocal, and
progressive prescription requirements;
another range of high-index barium glasses is
used for near-vision correction in multi focal
lens segments.
10
12. • Available in 2 forms
1) Glass high-index
2) Plastic high-index
• GHI are made up of titanium oxide, barium oxide or lead
oxide
• PHI are made up of Thermosetting plastics
• These lenses have higher than standard R.I.
• Most cosmetically acceptable lenses
• It enables the lens to bend light "faster".
• Hence they are lighter and thinner than standard lenses.
14. High index lens designs
• As technology has improved, so has the
availability of high index lens designs.
• High index is most commonly available
in multiple progressive and single vision
designs.
14
15. • Aspheric and atoric designs are also
becoming more readily available to the
eye care provider in high index materials.
• In aspheric and atoric designs, the lenses
are gradually steepened along the
periphery in minus designs and the
periphery is gradually flattened in plus
designs.
15
16. • High index is also available with polarization or
photo chromic options.
16
17. • When to recommend a high index
lens
• A general guideline is to recommend high
index materials for any patient with a
prescription of +/-3.00 D or more.
• Anything less than this prescription and
the weight and thinness benefits are
usually minimal.
17
18. • High index, especially the index of 1.67 and 1.70, is also an
excellent choice for individuals who want the minimalist look
of drilled rimless eyeglasses.
• There are some exceptions to fitting a high index lens,
however. One instance is children or individuals who have
severely decreased vision in one eye. In these cases, the
safety and impact resistance of polycarbonate or Trivex is
necessary to protect the patient’s vision.
18
19. ADVANTAGE OF HI INDEX LENSES
• Power rings round the edges of the lens is reduced.
• Reduce thickness.
• Look flatter.
• Thinner.
• Lighter.
• The benefit is greater peripheral vision as well as less
magnification or minification of the eye.
19
22. DISADVANTAGE OF HIGH INDEX LENSES
• Low Abbe number, increase chromatic
aberration.
• Poor light transmission and increased backside
and inner surface reflection increasing so
importance of anti-reflective coating.
• More expensive than normal lenses.
• Greater distortion away from the optical
centre.
22