Factors to consider when selecting a visual display unit:

1. Screen size: Consider the size of the screen based on your needs and available space. A larger screen may be more suitable for tasks that require detailed viewing, while a smaller screen may be sufficient for basic tasks.

2. Resolution: Higher resolution displays offer better image quality and clarity. Consider the resolution based on the type of content you will be viewing and the level of detail required.

3. Refresh rate: A higher refresh rate can result in smoother motion and reduced motion blur, which is important for tasks such as gaming or watching videos. Consider the refresh rate based on your specific needs.

4. Panel type: Different panel types, such as IPS, TN, and VA, offer different color accuracy, viewing angles, and response times. Consider the panel type based on your specific requirements.

5. Connectivity options: Consider the available connectivity options, such as HDMI, DisplayPort, and USB, to ensure compatibility with your devices and peripherals.

6. Ergonomics: Consider the adjustability options, such as height, tilt, and swivel, to ensure comfortable viewing angles and reduce strain on your eyes and neck.

7. Budget: Consider your budget and prioritize features based on your needs and preferences. There are a wide range of visual display units available at various price points.

8. Brand reputation: Consider the reputation of the brand and read reviews from other users to ensure reliability and quality of the visual display unit.

9. Energy efficiency: Consider the energy efficiency of the display unit to reduce energy consumption and lower operating costs in the long run.

10. Warranty and support: Consider the warranty and support options provided by the manufacturer to ensure peace of mind and assistance in case of any issues with the visual display unit.

1. Size and Resolution:
- Consider the size of the area where the VDU will be placed.
- Determine the optimal resolution for your intended use cases. Higher resolutions provide sharper images but may require more processing power.

2. Type of Display:
- CRT (Cathode Ray Tube): Older technology, known for large size, high refresh rates, and low cost.
- LCD (Liquid Crystal Display): Thin and lightweight, energy-efficient, and commonly used in laptops and monitors.
- OLED (Organic Light-Emitting Diode): High contrast ratios, wide color gamut, and thin profiles.

3. Brightness and Contrast Ratio:
- Measure brightness in nits or candelas per square meter (cd/m²). Higher brightness levels are better for bright environments.
- Contrast ratio indicates the difference between the brightest and darkest areas of the display. A higher contrast ratio provides a wider dynamic range.

4. Color Accuracy:
- Important for graphic design, photography, and video editing. Look for displays that cover a wide color gamut and have accurate color reproduction.

5. Viewing Angles:
- Refers to the range of angles from which the display can be viewed without significant color or brightness distortion. Wide viewing angles allow multiple users to view content comfortably.

6. Aspect Ratio:
- The ratio of the display's width to its height. Common aspect ratios include 16:9, 16:10, and 4:3. Choose an aspect ratio that best suits your content and intended use.

7. Refresh Rate:
- Measured in Hertz (Hz), it indicates the number of times the display updates its image per second. A higher refresh rate reduces motion blur and is especially important for gaming and fast-paced applications.

8. Response Time:
- Measured in milliseconds (ms), it refers to the time it takes for a pixel to change color. A lower response time reduces ghosting and is crucial for fast-paced content.

9. Ergonomics:
- Consider adjustable features such as height, tilt, and swivel to ensure comfortable viewing positions.

10. Additional Features:
- Smart TV capabilities, built-in speakers, curved screens, and touchscreens can enhance the user experience but come at a premium cost.