Readability, clear typography is a crucial aspect to consider when designing fonts. Legibility refers to the reader can read and understand the text. A font with good legibility in terms of legibility should have clear letterforms, adequate spacing between characters, and proper alignment on the baseline. The font should also be proportional, meaning that the relationship between large and small-sized letters is consistent and logical.

Another key consideration is readability, which refers to the reader can quickly and easily extract the meaning from the text. A font with good readability in terms of readability must have a straightforward, consistent design that minimizes visual distractions. The font should also be clear and distinct, without confusion between similar-looking characters.

Besides legibility and readability, design consistency is crucial when designing fonts. Consistency can be obtained through using consistent proportions, axis alignment, x-height, and weights across all font characters. A consistent font also must apply the same design principles used in italics and uppercase letters.

Style and tone are also essential factors when designing fonts. Different fonts can evoke different emotions, convey different messages, and convey the intended tone of the text. For instance, a serif font may convey a sense of elegance and tradition, while a sans-serif font may convey a sense of modernity and simplicity.

As screen resolution decreases, readability suffers when screen resolution is low, because characters on the screen become vague. A well-designed font regarding character strokes thickness of letters, thin or thick characters that form complete strokes, must be sufficient to prevent vague characters from becoming poorly visible when at a low screen resolution. The font should also be designed with consideration for a digital aspect with correct behavior of these character thickness, some typefaces designed in the past without thinking in digital do not work correctly and the resolution's of displays used nowadays.

Finally, a well-designed font must be scalable and versatile, capable of being used across different platforms, devices, and presentation formats. The font must be adjustable in terms of color, size, style, and weight, and it should adapt well to different screen sizes, resolutions, and layouts.

Ultimately, designing a font which effectively balances legibility, readability, consistency, style, and tone demands a deep understanding of typography, design principles, and the target audience. It is essential to conduct thorough technology first follower vs research, gather feedback, and iterate on the design to create that effectively communicates the message and leaves a lasting impression on the reader.