Abstract：
:It is traditionally taught in ophthalmic optics that the "effective" bifocal add is greater than the prescribed add in aphakic spectacles. Because the reading segment is fabricated on the front surface of the lens, the added back vertex power is significantly greater than the prescribed add. It is taught that the effective power should be measured at the back surface. The authors explain informally why the effective add is, in truth, exactly equal to the prescribed add and not equal to the difference in back vertex power between the top and bottom segments. Practitioners who prescribe spectacles by the traditional teaching may leave their aphakic patients with suboptimal reading vision.
journal_name
Ophthalmologyjournal_title
Ophthalmologyauthors
Maloney RK,Miller KM,Guyton DLdoi
10.1016/s0161-6420(89)32744-8subject
Has Abstractpub_date
1989-08-01 00:00:00pages
1253-6issue
8eissn
0161-6420issn
1549-4713pii
S0161-6420(89)32744-8journal_volume
96pub_type
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