Or Laeinayim is a special project developed by Shlomo Orbach for personal use.
The project was aimed to enable those with visual impairments to use Siddurim (Siddur plural Siddurim - traditional Jewish Hebrew prayer book), or read the weekly readings from the Tora and the Haftarot.
(see, for termilogy "Jewish prayer", Wikipedia)
Those with visual impairments, who have difficulties reading printed texts with the usual common letters' weights, use for reading and praying special optical devices for instance: special spectacles, magnifying glasses or computerized magnifying devices (which is somewhat inconvenient to use in a Synagogue).
They can also print enlarged printings of commercial Siddurim (if they have a relevant permission).
Commercial siddurim, even those whose letters are marked as very large letters, are usually not sufficient. In some of these Siddurim, the letters are narrowed and the amount of the letters' ink is lowered.
There are also, Siddurim and Machzorim which are intended to be used by the Hazan (Cantor) in the Synagogue. Although they are printed in a larger format, usually it is not enough.
(Machzor/Mahzor plural Machzorim - special Siddurim for the days of Awe: Rosh hashana &Yom Kippur and for the three Biblical festivals: Pessach, Shavuot & Sukkot).
The fonts used in the commercial Siddurim are, usually, not suitable for thse with vision difficulties
As it seems, the most preferred / optimal for those with visual impairments, is the Bold Times New Roman font. Its squared Hebrew letters have thickened horizontal & vertical parts and it has good distinguishing capability to distinguish between similar Hebrew letters such as ד/ר, ג/נ, ב/כ, ם/ס. .
Activities of "Or Laeinayim"
Shlomo Orbach prepared, initially, a variety of functional Siddurim for all the weekdays of the whole year, including for Rosh Hashana & Yom Kippur with their liturgical poems (Piyutim) - based on about 40 p. Bold Times New Roman letters.
The printed texts of the weekly readings from the Tora and the Haftarot were prepared, initially, without Cantillation Marks.
Later on, Cantillation Marks were added.
The number of fonts supporting Cantillation Marks is limited, some of them are expensive and very few can be downloaded freely.
But, most of the available fonts supporting Cantillation Marks are not sufficient for those who have vision difficulties.
Shlomo Orbach developed a group / family of fonts supporting Cantillation Marks (The Shlomo fonts) , based on the Ezra SIL fonts (with the permission of SIL.org.).
(See explanations and examples of the Shlomo fonts here).
The Hebrew letters of the "Shlomo Bold font" are similar to those of the Bold Times New Roman. (Times New Roman fonts don't support Cantillation Marks).
The Shlomo Bold font is therefore more suitable for those with visual impairments.
The Outputs of "Or Laeinayim" and their use
The outputs of Or Laeinayim are printed, for personal use, in two formats: a large format (A4 format) and a smaller format (A5 format) which is based o the A4 format.
The A5 format is half the size & weight of the A4 format and its letters are about 70% of those in the A4 format.
The A5 format is used by those with good eyesight.
Some outputs were prepared especially for children and youngsters.
The functional Siddurim include only the relevant passages to be recited at this period of day or time.
It is, therefore, very useful by youngsters who don't know exactly, in a regular commercial Siddur, which passage to recite and which to skip.
The outputsof Or Laeinayim with Cantillation Marks are done now, mainly with the (35 p.) Shlomo Bold font
The outputs with Cantillation Marks are used also by those with good eyesight, while preparing to read from the Tora scroll or from printed Megilot.
Special Tikoon Korim for relevant Parashot and Megilot were also prepared.
See a shortened list (in Hebrew) of the outputs of Or Laeinayim in the titles page.