4. A method according to claim 3, wherein said second magnification level comprises a range of vertical magnification levels that decrease in proportion to vertical distance from said lens.
4. A method according to claim 3, wherein said second magnification level comprises a range of vertical magnification levels that decrease in proportion to vertical distance from said lens. 5. A method according to claim 4, further comprising: when said vertical magnification level would cause corresponding contents of said document to be displayed illegibly, displaying in said window, in lieu of said corresponding contents, textual characters that are less complex than said corresponding contents.