Table of Content 1 Optometry Instruments Market Definition and Overview 1.1 Objectives of the Study 1.2 Overview of Optometry Instruments 1.3 Optometry Instruments Market Scope and Market Size Estimation 1.4 Market Segmentation 1.4.1 Types of Optometry Instruments 1.4.2 Applications of Optometry Instruments 1.5 Market Exchange Rate 2 Research Method and Logic 2.1 Methodology 2.2 Research Data Source 3 Market Competition Analysis 3.1 NIDEK Market Performance Analysis 3.1.1 NIDEK Basic Information 3.1.2 Product and Service Analysis 3.1.3 Strategies for Company to Deal with the Impact of COVID-19 3.1.4 NIDEK Sales, Value, Price, Gross Margin 2016-2021 3.2 Tiannuo Optical Instrument Market Performance Analysis 3.2.1 Tiannuo Optical Instrument Basic Information 3.2.2 Product and Service Analysis 3.2.3 Strategies for Company to Deal with the Impact of COVID-19 3.2.4 Tiannuo Optical Instrument Sales, Value, Price, Gross Margin 2016-2021 3.3 Zhejiang Weizhen Medical Technology Co., Ltd. Market Performance Analysis 3.3.1 Zhejiang Weizhen Medical Technology Co., Ltd. Basic Information 3.3.2 Product and Service Analysis 3.3.3 Strategies for Company to Deal with the Impact of COVID-19 3.3.4 Zhejiang Weizhen Medical Technology Co., Ltd. Sales, Value, Price, Gross Margin 2016-2021 3.4 Canon Market Performance Analysis 3.4.1 Canon Basic Information 3.4.2 Product and Service Analysis 3.4.3 Strategies for Company to Deal with the Impact of COVID-19 3.4.4 Canon Sales, Value, Price, Gross Margin 2016-2021 3.5 Alcon Market Performance Analysis 3.5.1 Alcon Basic Information 3.5.2 Product and Service Analysis 3.5.3 Strategies for Company to Deal with the Impact of COVID-19 3.5.4 Alcon Sales, Value, Price, Gross Margin 2016-2021 3.6 Topcon Medical Systems Market Performance Analysis 3.6.1 Topcon Medical Systems Basic Information 3.6.2 Product and Service Analysis 3.6.3 Strategies for Company to Deal with the Impact of COVID-19 3.6.4 Topcon Medical Systems Sales, Value, Price, Gross Margin 2016-2021 3.7 Carl Zeiss Market Performance Analysis 3.7.1 Carl Zeiss Basic Information 3.7.2 Product and Service Analysis 3.7.3 Strategies for Company to Deal with the Impact of COVID-19 3.7.4 Carl Zeiss Sales, Value, Price, Gross Margin 2016-2021 3.8 Unitech Vision Market Performance Analysis 3.8.1 Unitech Vision Basic Information 3.8.2 Product and Service Analysis 3.8.3 Strategies for Company to Deal with the Impact of COVID-19 3.8.4 Unitech Vision Sales, Value, Price, Gross Margin 2016-2021 4 Market Segment by Type, Historical Data and Market Forecasts 4.1 Global Optometry Instruments Production and Value by Type 4.1.1 Global Optometry Instruments Production by Type 2016-2021 4.1.2 Global Optometry Instruments Market Value by Type 2016-2021 4.2 Global Optometry Instruments Market Production, Value and Growth Rate by Type 2016-2021 4.2.1 Retina Examination Market Production, Value and Growth Rate 4.2.2 General Examination Market Production, Value and Growth Rate 4.2.3 Cornea Examination Market Production, Value and Growth Rate 4.3 Global Optometry Instruments Production and Value Forecast by Type 4.3.1 Global Optometry Instruments Production Forecast by Type 2021-2026 4.3.2 Global Optometry Instruments Market Value Forecast by Type 2021-2026 4.4 Global Optometry Instruments Market Production, Value and Growth Rate by Type Forecast 2021-2026 4.4.1 Retina Examination Market Production, Value and Growth Rate Forecast 4.4.2 General Examination Market Production, Value and Growth Rate Forecast 4.4.3 Cornea Examination Market Production, Value and Growth Rate Forecast 5 Market Segment by Application, Historical Data and Market Forecasts 5.1 Global Optometry Instruments Consumption and Value by Application 5.1.1 Global Optometry Instruments Consumption by Application 2016-2021 5.1.2 Global Optometry Instruments Market Value by Application 2016-2021 5.2 Global Optometry Instruments Market Consumption, Value and Growth Rate by Application 2016-2021 5.2.1 Optical Retail Market Consumption, Value and Growth Rate 5.2.2 Eye Clinics Market Consumption, Value and Growth Rate 5.2.3 Hospitals Market Consumption, Value and Growth Rate 5.3 Global Optometry Instruments Consumption and Value Forecast by Application 5.3.1 Global Optometry Instruments Consumption Forecast by Application 2021-2026 5.3.2 Global Optometry Instruments Market Value Forecast by Application 2021-2026 5.4 Global Optometry Instruments Market Consumption, Value and Growth Rate by Application Forecast 2021-2026 5.4.1 Optical Retail Market Consumption, Value and Growth Rate Forecast 5.4.2 Eye Clinics Market Consumption, Value and Growth Rate Forecast 5.4.3 Hospitals Market Consumption, Value and Growth Rate Forecast 6 Global Optometry Instruments by Region, Historical Data and Market Forecasts 6.1 Global Optometry Instruments Sales by Region 2016-2021 6.2 Global Optometry Instruments Market Value by Region 2016-2021 6.3 Global Optometry Instruments Market Sales, Value and Growth Rate by Region 2016-2021 6.3.1 North America 6.3.2 Europe 6.3.3 Asia Pacific 6.3.4 South America 6.3.5 Middle East and Africa 6.4 Global Optometry Instruments Sales Forecast by Region 2021-2026 6.5 Global Optometry Instruments Market Value Forecast by Region 2021-2026 6.6 Global Optometry Instruments Market Sales, Value and Growth Rate Forecast by Region 2021-2026 6.6.1 North America 6.6.2 Europe 6.6.3 Asia Pacific 6.6.4 South America 6.6.5 Middle East and Africa 7 United State Market Size Analysis 2016-2026 7.1 United State Optometry Instruments Value and Market Growth 2016-2021 7.2 United State Optometry Instruments Sales and Market Growth 2016-2021 7.3 United State Optometry Instruments Market Value Forecast 2021-2026 8 Canada Market Size Analysis 2016-2026 8.1 Canada Optometry Instruments Value and Market Growth 2016-2021 8.2 Canada Optometry Instruments Sales and Market Growth 2016-2021 8.3 Canada Optometry Instruments Market Value Forecast 2021-2026 9 Germany Market Size Analysis 2016-2026 9.1 Germany Optometry Instruments Value and Market Growth 2016-2021 9.2 Germany Optometry Instruments Sales and Market Growth 2016-2021 9.3 Germany Optometry Instruments Market Value Forecast 2021-2026 10 UK Market Size Analysis 2016-2026 10.1 UK Optometry Instruments Value and Market Growth 2016-2021 10.2 UK Optometry Instruments Sales and Market Growth 2016-2021 10.3 UK Optometry Instruments Market Value Forecast 2021-2026 11 France Market Size Analysis 2016-2026 11.1 France Optometry Instruments Value and Market Growth 2016-2021 11.2 France Optometry Instruments Sales and Market Growth 2016-2021 11.3 France Optometry Instruments Market Value Forecast 2021-2026 12 Italy Market Size Analysis 2016-2026 12.1 Italy Optometry Instruments Value and Market Growth 2016-2021 12.2 Italy Optometry Instruments Sales and Market Growth 2016-2021 12.3 Italy Optometry Instruments Market Value Forecast 2021-2026 13 Spain Market Size Analysis 2016-2026 13.1 Spain Optometry Instruments Value and Market Growth 2016-2021 13.2 Spain Optometry Instruments Sales and Market Growth 2016-2021 13.3 Spain Optometry Instruments Market Value Forecast 2021-2026 14 Russia Market Size Analysis 2016-2026 14.1 Russia Optometry Instruments Value and Market Growth 2016-2021 14.2 Russia Optometry Instruments Sales and Market Growth 2016-2021 14.3 Russia Optometry Instruments Market Value Forecast 2021-2026 15 China Market Size Analysis 2016-2026 15.1 China Optometry Instruments Value and Market Growth 2016-2021 15.2 China Optometry Instruments Sales and Market Growth 2016-2021 15.3 China Optometry Instruments Market Value Forecast 2021-2026 16 Japan Market Size Analysis 2016-2026 16.1 Japan Optometry Instruments Value and Market Growth 2016-2021 16.2 Japan Optometry Instruments Sales and Market Growth 2016-2021 16.3 Japan Optometry Instruments Market Value Forecast 2021-2026 17 South Korea Market Size Analysis 2016-2026 17.1 South Korea Optometry Instruments Value and Market Growth 2016-2021 17.2 South Korea Optometry Instruments Sales and Market Growth 2016-2021 17.3 South Korea Optometry Instruments Market Value Forecast 2021-2026 18 Australia Market Size Analysis 2016-2026 18.1 Australia Optometry Instruments Value and Market Growth 2016-2021 18.2 Australia Optometry Instruments Sales and Market Growth 2016-2021 18.3 Australia Optometry Instruments Market Value Forecast 2021-2026 19 Thailand Market Size Analysis 2016-2026 19.1 Thailand Optometry Instruments Value and Market Growth 2016-2021 19.2 Thailand Optometry Instruments Sales and Market Growth 2016-2021 19.3 Thailand Optometry Instruments Market Value Forecast 2021-2026 20 Brazil Market Size Analysis 2016-2026 20.1 Brazil Optometry Instruments Value and Market Growth 2016-2021 20.2 Brazil Optometry Instruments Sales and Market Growth 2016-2021 20.3 Brazil Optometry Instruments Market Value Forecast 2021-2026 21 Argentina Market Size Analysis 2016-2026 21.1 Argentina Optometry Instruments Value and Market Growth 2016-2021 21.2 Argentina Optometry Instruments Sales and Market Growth 2016-2021 21.3 Argentina Optometry Instruments Market Value Forecast 2021-2026 22 Chile Market Size Analysis 2016-2026 22.1 Chile Optometry Instruments Value and Market Growth 2016-2021 22.2 Chile Optometry Instruments Sales and Market Growth 2016-2021 22.3 Chile Optometry Instruments Market Value Forecast 2021-2026 23 South Africa Market Size Analysis 2016-2026 23.1 South Africa Optometry Instruments Value and Market Growth 2016-2021 23.2 South Africa Optometry Instruments Sales and Market Growth 2016-2021 23.3 South Africa Optometry Instruments Market Value Forecast 2021-2026 24 Egypt Market Size Analysis 2016-2026 24.1 Egypt Optometry Instruments Value and Market Growth 2016-2021 24.2 Egypt Optometry Instruments Sales and Market Growth 2016-2021 24.3 Egypt Optometry Instruments Market Value Forecast 2021-2026 25 UAE Market Size Analysis 2016-2026 25.1 UAE Optometry Instruments Value and Market Growth 2016-2021 25.2 UAE Optometry Instruments Sales and Market Growth 2016-2021 25.3 UAE Optometry Instruments Market Value Forecast 2021-2026 26 Saudi Arabia Market Size Analysis 2016-2026 26.1 Saudi Arabia Optometry Instruments Value and Market Growth 2016-2021 26.2 Saudi Arabia Optometry Instruments Sales and Market Growth 2016-2021 26.3 Saudi Arabia Optometry Instruments Market Value Forecast 2021-2026 27 Market Dynamic Analysis and Development Suggestions 27.1 Market Drivers 27.2 Market Development Constraints 27.3 PEST Analysis 27.3.1 Political Factors 27.3.2 Economic Factors 27.3.3 Social Factors 27.3.4 Technological Factors 27.4 Industry Trends Under COVID-19 27.4.1 Risk Assessment on COVID-19 27.4.2 Assessment of the Overall Impact of COVID-19 on the Industry 27.4.3 Pre COVID-19 and Post COVID-19 Market Scenario 27.5 Market Entry Strategy Analysis 27.5.1 Market Definition 27.5.2 Client 27.5.3 Distribution Model 27.5.4 Product Messaging and Positioning 27.5.5 Price 27.6 Advice on Entering the Market

List of Tables and Figures Market Size Comparison Before and After the COVID-19 Outbreak of Major Company Global Optometry Instruments Market Size in 2020 and 2026 Market Size Comparison Before and After the COVID-19 Outbreak of Major Countries Figure Global Optometry Instruments Value (M USD) Segment by Type from 2016-2021 Figure Global Optometry Instruments Market (M USD) Share by Types in 2020 Table Different Applications of Optometry Instruments Figure Global Optometry Instruments Value (M USD) Segment by Applications from 2016-2021 Figure Global Optometry Instruments Market Share by Applications in 2020 Table Market Exchange Rate Table NIDEK Basic Information Table Product and Service Analysis Table NIDEK Sales, Value, Price, Gross Margin 2016-2021 Table Tiannuo Optical Instrument Basic Information Table Product and Service Analysis Table Tiannuo Optical Instrument Sales, Value, Price, Gross Margin 2016-2021 Table Zhejiang Weizhen Medical Technology Co., Ltd. Basic Information Table Product and Service Analysis Table Zhejiang Weizhen Medical Technology Co., Ltd. Sales, Value, Price, Gross Margin 2016-2021 Table Canon Basic Information Table Product and Service Analysis Table Canon Sales, Value, Price, Gross Margin 2016-2021 Table Alcon Basic Information Table Product and Service Analysis Table Alcon Sales, Value, Price, Gross Margin 2016-2021 Table Topcon Medical Systems Basic Information Table Product and Service Analysis Table Topcon Medical Systems Sales, Value, Price, Gross Margin 2016-2021 Table Carl Zeiss Basic Information Table Product and Service Analysis Table Carl Zeiss Sales, Value, Price, Gross Margin 2016-2021 Table Unitech Vision Basic Information Table Product and Service Analysis Table Unitech Vision Sales, Value, Price, Gross Margin 2016-2021 Table Global Optometry Instruments Consumption by Type 2016-2021 Table Global Optometry Instruments Consumption Share by Type 2016-2021 Table Global Optometry Instruments Market Value (M USD) by Type 2016-2021 Table Global Optometry Instruments Market Value Share by Type 2016-2021 Figure Global Optometry Instruments Market Production and Growth Rate of Retina Examination 2016-2021 Figure Global Optometry Instruments Market Value and Growth Rate of Retina Examination 2016-2021 Figure Global Optometry Instruments Market Production and Growth Rate of General Examination 2016-2021 Figure Global Optometry Instruments Market Value and Growth Rate of General Examination 2016-2021 Figure Global Optometry Instruments Market Production and Growth Rate of Cornea Examination 2016-2021 Figure Global Optometry Instruments Market Value and Growth Rate of Cornea Examination 2016-2021 Table Global Optometry Instruments Consumption Forecast by Type 2021-2026 Table Global Optometry Instruments Consumption Share Forecast by Type 2021-2026 Table Global Optometry Instruments Market Value (M USD) Forecast by Type 2021-2026 Table Global Optometry Instruments Market Value Share Forecast by Type 2021-2026 Figure Global Optometry Instruments Market Production and Growth Rate of Retina Examination Forecast 2021-2026 Figure Global Optometry Instruments Market Value and Growth Rate of Retina Examination Forecast 2021-2026 Figure Global Optometry Instruments Market Production and Growth Rate of General Examination Forecast 2021-2026 Figure Global Optometry Instruments Market Value and Growth Rate of General Examination Forecast 2021-2026 Figure Global Optometry Instruments Market Production and Growth Rate of Cornea Examination Forecast 2021-2026 Figure Global Optometry Instruments Market Value and Growth Rate of Cornea Examination Forecast 2021-2026 Table Global Optometry Instruments Consumption by Application 2016-2021 Table Global Optometry Instruments Consumption Share by Application 2016-2021 Table Global Optometry Instruments Market Value (M USD) by Application 2016-2021 Table Global Optometry Instruments Market Value Share by Application 2016-2021 Figure Global Optometry Instruments Market Consumption and Growth Rate of Optical Retail 2016-2021 Figure Global Optometry Instruments Market Value and Growth Rate of Optical Retail 2016-2021Figure Global Optometry Instruments Market Consumption and Growth Rate of Eye Clinics 2016-2021 Figure Global Optometry Instruments Market Value and Growth Rate of Eye Clinics 2016-2021Figure Global Optometry Instruments Market Consumption and Growth Rate of Hospitals 2016-2021 Figure Global Optometry Instruments Market Value and Growth Rate of Hospitals 2016-2021Table Global Optometry Instruments Consumption Forecast by Application 2021-2026 Table Global Optometry Instruments Consumption Share Forecast by Application 2021-2026 Table Global Optometry Instruments Market Value (M USD) Forecast by Application 2021-2026 Table Global Optometry Instruments Market Value Share Forecast by Application 2021-2026 Figure Global Optometry Instruments Market Consumption and Growth Rate of Optical Retail Forecast 2021-2026 Figure Global Optometry Instruments Market Value and Growth Rate of Optical Retail Forecast 2021-2026 Figure Global Optometry Instruments Market Consumption and Growth Rate of Eye Clinics Forecast 2021-2026 Figure Global Optometry Instruments Market Value and Growth Rate of Eye Clinics Forecast 2021-2026 Figure Global Optometry Instruments Market Consumption and Growth Rate of Hospitals Forecast 2021-2026 Figure Global Optometry Instruments Market Value and Growth Rate of Hospitals Forecast 2021-2026 Table Global Optometry Instruments Sales by Region 2016-2021 Table Global Optometry Instruments Sales Share by Region 2016-2021 Table Global Optometry Instruments Market Value (M USD) by Region 2016-2021 Table Global Optometry Instruments Market Value Share by Region 2016-2021 Figure North America Optometry Instruments Sales and Growth Rate 2016-2021 Figure North America Optometry Instruments Market Value (M USD) and Growth Rate 2016-2021 Figure Europe Optometry Instruments Sales and Growth Rate 2016-2021 Figure Europe Optometry Instruments Market Value (M USD) and Growth Rate 2016-2021 Figure Asia Pacific Optometry Instruments Sales and Growth Rate 2016-2021 Figure Asia Pacific Optometry Instruments Market Value (M USD) and Growth Rate 2016-2021 Figure South America Optometry Instruments Sales and Growth Rate 2016-2021 Figure South America Optometry Instruments Market Value (M USD) and Growth Rate 2016-2021 Figure Middle East and Africa Optometry Instruments Sales and Growth Rate 2016-2021 Figure Middle East and Africa Optometry Instruments Market Value (M USD) and Growth Rate 2016-2021 Table Global Optometry Instruments Sales Forecast by Region 2021-2026 Table Global Optometry Instruments Sales Share Forecast by Region 2021-2026 Table Global Optometry Instruments Market Value (M USD) Forecast by Region 2021-2026 Table Global Optometry Instruments Market Value Share Forecast by Region 2021-2026 Figure North America Optometry Instruments Sales and Growth Rate Forecast 2021-2026 Figure North America Optometry Instruments Market Value (M USD) and Growth Rate Forecast 2021-2026 Figure Europe Optometry Instruments Sales and Growth Rate Forecast 2021-2026 Figure Europe Optometry Instruments Market Value (M USD) and Growth Rate Forecast 2021-2026 Figure Asia Pacific Optometry Instruments Sales and Growth Rate Forecast 2021-2026 Figure Asia Pacific Optometry Instruments Market Value (M USD) and Growth Rate Forecast 2021-2026 Figure South America Optometry Instruments Sales and Growth Rate Forecast 2021-2026 Figure South America Optometry Instruments Market Value (M USD) and Growth Rate Forecast 2021-2026 Figure Middle East and Africa Optometry Instruments Sales and Growth Rate Forecast 2021-2026 Figure Middle East and Africa Optometry Instruments Market Value (M USD) and Growth Rate Forecast 2021-2026 Figure United State Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure United State Optometry Instruments Sales and Market Growth 2016-2021 Figure United State Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Canada Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Canada Optometry Instruments Sales and Market Growth 2016-2021 Figure Canada Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Germany Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Germany Optometry Instruments Sales and Market Growth 2016-2021 Figure Germany Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure UK Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure UK Optometry Instruments Sales and Market Growth 2016-2021 Figure UK Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure France Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure France Optometry Instruments Sales and Market Growth 2016-2021 Figure France Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Italy Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Italy Optometry Instruments Sales and Market Growth 2016-2021 Figure Italy Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Spain Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Spain Optometry Instruments Sales and Market Growth 2016-2021 Figure Spain Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Russia Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Russia Optometry Instruments Sales and Market Growth 2016-2021 Figure Russia Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure China Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure China Optometry Instruments Sales and Market Growth 2016-2021 Figure China Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Japan Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Japan Optometry Instruments Sales and Market Growth 2016-2021 Figure Japan Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure South Korea Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure South Korea Optometry Instruments Sales and Market Growth 2016-2021 Figure South Korea Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Australia Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Australia Optometry Instruments Sales and Market Growth 2016-2021 Figure Australia Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Thailand Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Thailand Optometry Instruments Sales and Market Growth 2016-2021 Figure Thailand Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Brazil Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Brazil Optometry Instruments Sales and Market Growth 2016-2021 Figure Brazil Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Argentina Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Argentina Optometry Instruments Sales and Market Growth 2016-2021 Figure Argentina Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Chile Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Chile Optometry Instruments Sales and Market Growth 2016-2021 Figure Chile Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure South Africa Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure South Africa Optometry Instruments Sales and Market Growth 2016-2021 Figure South Africa Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Egypt Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Egypt Optometry Instruments Sales and Market Growth 2016-2021 Figure Egypt Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure UAE Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure UAE Optometry Instruments Sales and Market Growth 2016-2021 Figure UAE Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Figure Saudi Arabia Optometry Instruments Value (M USD) and Market Growth 2016-2021 Figure Saudi Arabia Optometry Instruments Sales and Market Growth 2016-2021 Figure Saudi Arabia Optometry Instruments Market Value and Growth Rate Forecast 2021-2026 Table Market Drivers Table Market Development Constraints Table PEST Analysis