The eye must be able to change its refractive properties to focus images of both distant and nearby objects on the retina. Distant objects (greater than 30 feet or 9 meters away from the eye) emit or reflect light that can be focused on the retina in a normal relaxed eye (Figure 14.8).
Ramona is a census-designated place (CDP) in San Diego County, California. The population was 20,292 at the 2010 census. The term Ramona also refers to an unincorporated community (with some plans to incorporate) that includes both the Ramona CDP and the adjacent CDP of San Diego Country Estates.
Because Ramona is not an incorporated city, there are no city limits by which to measure its area. There are primarily three geographic areas by which the land area of Ramona is measured: 1. The boundaries of the Ramona Municipal Water District (approximately 75 square miles (194 km2)); 2. The boundaries of the Ramona Unified School District (approximately 150 square miles (390 km2)), and; 3.